Mixed Minerals!


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OMR01 Clinoatacamite
Lily Mine (Lilly Mine), Pisco Umay, Ica Department, Peru
16.0x 13.4x 6.7 cm
$2900

A large and exceptionally rich cabinet specimen of clinoatacamite, hosting numerous dark green clusters of the mineral set against a matrix covered by blue chrysocolla over quartz.

 

I purchased a large lot of Lilly Mine material while in Peru, the bulk of the specimens were mainly just druses of quartz over chrysocolla or malachite, though there were a small quantity of these very rare clinoatacamite specimens as well.

 

The majority of the examples I have seen have the crystals somewhat jumbled together, or set against dark green malachite matrixes.  As a result, the crystals can be hard to properly appreciate.  The contrasting background and distinct nature of the crystals and crystal clusters make the clinoatacamite on this piece easier to discern and appreciate.

 

There are some blemishes to the display face, though overall the specimen is exactly as shown.












OMR02 Hutchinsonite
Quiruvilca Dist., Santiago de Chuco Prov., La Libertad Dept., Peru
17.0x 11.4x 4.1 cm
$0

An exceptionally rich cabinet specimen of this rare thallium bearing mineral, hosting numerous elongated bright crystals sprinkled on a matrix of matte gray sulfides.

Most of the hutchinsonite specimens in collections were recovered from this locality in the 70's and 80's (many had the crystals occurring on orpiment), though over the last 2-3 years I have seen a couple lone examples from more recent workings.  This was the largest single lot I have seen-- given how infrequently they were turning up, I was a bit surprised to come across so many-- and I'm posting all of them here.

Hutchinsonite is a sulfide of thallium, lead, and arsenic and is probably one of the few minerals containing thallium that you can actually find a decent specimen of.









OMR03 Hutchinsonite
Quiruvilca Dist., Santiago de Chuco Prov., La Libertad Dept., Peru
8.4x 5.6x 1.5 cm
$0

An rich cabinet specimen of this rare thallium bearing mineral, hosting numerous elongated bright crystals sprinkled on a matrix of matte gray sulfides.  

While not the largest, I consider this one to be the best from the group.

Most of the hutchinsonite specimens in collections were recovered from this locality in the 70's and 80's (many had the crystals occurring on orpiment), though over the last 2-3 years I have seen a couple lone examples from more recent workings.  This was the largest single lot I have seen-- given how infrequently they were turning up, I was a bit surprised to come across so many-- and I'm posting all of them here.

Hutchinsonite is a sulfide of thallium, lead, and arsenic and is probably one of the few minerals containing thallium that you can actually find a decent specimen of.









OMR04 Hutchinsonite
Quiruvilca Dist., Santiago de Chuco Prov., La Libertad Dept., Peru
7.0x 6.3x 3.7 cm
$400

An rich cabinet specimen of this rare thallium bearing mineral, hosting numerous elongated bright crystals sprinkled on a matrix of matte gray sulfides.  

Most of the hutchinsonite specimens in collections were recovered from this locality in the 70's and 80's (many had the crystals occurring on orpiment), though over the last 2-3 years I have seen a couple lone examples from more recent workings.  This was the largest single lot I have seen-- given how infrequently they were turning up, I was a bit surprised to come across so many-- and I'm posting all of them here.

Hutchinsonite is a sulfide of thallium, lead, and arsenic and is probably one of the few minerals containing thallium that you can actually find a decent specimen of.









OMR05 Hutchinsonite
Quiruvilca Dist., Santiago de Chuco Prov., La Libertad Dept., Peru
7.3x 2.6x 2.5 cm
$190

An rich cabinet specimen of this rare thallium bearing mineral, hosting numerous elongated bright crystals sprinkled on a matrix of matte gray sulfides.  

Most of the hutchinsonite specimens in collections were recovered from this locality in the 70's and 80's (many had the crystals occurring on orpiment), though over the last 2-3 years I have seen a couple lone examples from more recent workings.  This was the largest single lot I have seen-- given how infrequently they were turning up, I was a bit surprised to come across so many-- and I'm posting all of them here.

Hutchinsonite is a sulfide of thallium, lead, and arsenic and is probably one of the few minerals containing thallium that you can actually find a decent specimen of.







OMR07 Hutchinsonite
Quiruvilca Dist., Santiago de Chuco Prov., La Libertad Dept., Peru
3.4x 1.7x 1.0 cm
$170

An rich specimen of this rare thallium bearing mineral, hosting numerous elongated bright crystals sprinkled on a matrix of matte gray sulfides.  

I am not sure if this will fit into a perky box, but if not a minor trim would make for an excellent thumbnail of the species.

Most of the hutchinsonite specimens in collections were recovered from this locality in the 70's and 80's (many had the crystals occurring on orpiment), though over the last 2-3 years I have seen a couple lone examples from more recent workings.  This was the largest single lot I have seen-- given how infrequently they were turning up, I was a bit surprised to come across so many-- and I'm posting all of them here.

Hutchinsonite is a sulfide of thallium, lead, and arsenic and is probably one of the few minerals containing thallium that you can actually find a decent specimen of.









OMR08 Ilvaite with Hedenbergite
Huanggang Mine, Hexigten Banner (Keshiketeng Co.), Ulanhad League (Chifeng Prefecture), Inner Mongolia Autonomous Region, China
9.8x 9.0x 9.6 cm
$385

A beautiful example of radiating ilvaite crystals, lightly coated by green hedenbergite.  While the majority of ilvaites recovered from the location have been single crystals, these ball-shaped clusters were among the first to come from the mine, back in 2010-2011.

This one has more symmetry and better form than most.







OMR09 Ilvaite with Quartz?
Huanggang Mine, Hexigten Banner (Keshiketeng Co.), Ulanhad League (Chifeng Prefecture), Inner Mongolia Autonomous Region, China
6.6x 6.5x 6.0 cm
$200

A radiating cluster of ilvaite, coated first with hedenbergite and then a successive layer of another greenish white mineral. Although I have seen quite a few of these--this habit of ilvaite was among the first type of specimen to come from the mine-- this is the only specimen I have seen with this odd white-ish coating.  At first I thought it might be a pseudomorph (it isn't) but regardless, I liked the clean and sculptural appearance of this very unique piece.







OMR10 Powellite
Nasik Area, Maharashtra State, India
5.7x 3.9x 2.8 cm
$0

A ball-shaped cluster of pointy powellite crystals, with a bit of matrix.  Powellite is one of the most sought after minerals from the Deccan plateau-- unlike most of the zeolite species that are also found there (stilbite, heulandite, etc.) this species has never been found in any appreciable quantity.  With that said, these days, you would probably see a higher asking price in the room of an Indian dealer in Tucson, if they had a specimen in the first place.  This piece comes from an old collection.

As a side note, powellite is not a zeollite-- it is a calcium molybdate that forms a solution series with scheelite.  

There are saw marks around the back and back-facing edges.











OMR11 Copper
Mountain City Mine, Mountain City District., Elko Co., Nevada, United States
6.8x 4.3x 2.1 cm
$300

An excellent example of copper from Nevada.  At first glance, it would be easy to mistake this as being from a more famous copper locality (say, in Michigan) but this is a considerably rarer example.  

This is decently sized for the location, and shows very good crystallization.  Most interesting however, are the narrow, exaggeratedly elongated crystals that almost look like wires.  Unlike silver, copper does not usually form wires (and again, these look like hyper-elongated crystals, not wires) but to see any copper with that appearance is highly unusual.













OMR12 Boleite
Amalia Mine, Santa Rosalia Co., Baja California, Mexico
4.5x 3.2x 4.0 cm
$225

A much sought after matrix specimen of this rare silver bearing halide.  Boleite is known from a number of localities, though those from Mexico and Chile are the most well known. The samples from Mexico however, are the only ones that ever display crystals larger than micromounts.

The primary reason that matrix specimens are so rare, is that the crystals are found in clay.  Unless that clay is stabilized (as in this case) the clay crumbles, leaving lone blue cubes.

In the closeup, you can see that the crystal's edges have a bit of a beveled appearance-- that is due to an epitaxial growth of pseudoboleite.











OMR13 Stibnite
Raura District., Cajatambo Prov., Lima Dept., Peru
5.9x 5.9x 3.3 cm
$165

A (reasonably) rare and old example of stibnite from Peru.  Unlike the more contemporary stibnites from Quiruvilca, this specimen displays well defined, isolated crystals (the Quiruvilca pieces tend to be tightly packed masses.)

The specimen is very well balanced, and I particularly like seeing the stibnite on a solid (non-stibnite) matrix.  Even among the endless specimens from China, seeing an isolated stibnite crystal on a "matrix" that is not just more stibnite is highly unusual-- and if you do see a matrix, then a stibnite will likely be a cluster of small crystals.

This is very old material-- even in Peru, specimens from Raura are not often seen.







OMR15 Helvite
Navegadora Mine, Penha do Norte, Conseheiro Pena, Doce Valley, Minas Gerais, Brazil
6.5x 5.0x 4.0 cm
$160

A group of helvite crystals on an albite matrix, from the 2004 find at the same mine that produced the intensely red spessartine floater crystals.

Helvite is the manganese rich member of genthelvite-helvite series.









OMR17 Mottramite
Mina Ojuela, Mapimi, Durango, Mexico
6.2x 3.8x 2.9 cm
$165

An exceptionally good miniature specimen of mottramite with a very organic appearance, from the find made 2-3 years ago at the Ojuela Mine.  This one is complete all around, and has a number of very small wulfenites sprinkled near the base and on the reverse.











OMR19 Cerussite
Mina Ojuela, Mapimi, Durango, Mexico
5.1x 3.7x 2.6 cm
$125

A number of sharp smoky cerussite crystals on matrix.  Cerussite has never been particularly common at Mina Ojuela, but there was recently a sizable find of the material.  

 

Mexican mineral collectors highly prize Ojuela cerussites, and when you actually do see one, it will often be priced at a premium.  

 

This one is a particularly good miniature from the find.










OMR20 Cerussite
Mina Ojuela, Mapimi, Durango, Mexico
3.9x 3.5x 3.3 cm
$125

A number of sharp smoky cerussite crystals on matrix.  Cerussite has never been particularly common at Mina Ojuela, but there was recently a sizable find of the material.  

 

This one is less messy in person-- the crystals are actually quite sharp, and it hosts a pair of smoky twins near the top, as well as a somewhat rarer (for this find) clear crystal near the center.


Mexican mineral collectors highly prize Ojuela cerussites, and when you actually do see one, it will often be priced at a premium.  

 

This one is a particularly good miniature from the find.










OMR21 Cerussite
Mina Ojuela, Mapimi, Durango, Mexico
4.8x 4.0x 2.0 cm
$165

A number of sharp cerussite crystals on matrix.  Cerussite has never been particularly common at Mina Ojuela, but there was recently a sizable find of the material.  


This specimen hosts a number of colorless crystals-- relatively few specimens were colorless, the bulk of what was recovered consisted of smoky crystals, the result of minute sulfide inclusions. 

 

Mexican mineral collectors highly prize Ojuela cerussites, and when you actually do see one, it will often be priced at a premium.  

 

This one is a particularly good miniature from the find.










OMR23 Betafite
Silver Crater Mine, Bancroft, Ontario, Canada
2.3X 2.2X 1.8 CM
$145

A sharp and sizable cluster of betafite crystals, from the Silver Crater Mine.  This locality has arguably produced the best crystals of this uranium bearing species, almost always outdoing those from Madagascar and Norway (which produced the only other examples you are likely to see) in terms of sharpness, size, and form.

This specimen was purchased from the field collectors who dug it up.  Apparently they can't bring them over the US-Canada border any more, due to overzealous border patrol officers. Actually, I have heard more than a couple first hand stories form different collectors about officers who are not entirely familiar with the rules, getting a little too excited at having prevented the "next big terror attack" by catching someone crossing the border with "radioactive materials..."

  







OMR25 Pyrite
Peru and Arizona
See description
$100

A set of single crystals of the three main forms of pyrite.  I've intentionally photographed them to show both the display faces, and any flaws or contacts.  Properly displayed, all you'll see are the clean crystals.

Cube- Racracancha Mine, Peru. 2.05x 1.9x 1.95 cm (it's not 100% cubic and has a step face on the back, but still pretty close)
Octahedron- Huanzala Mine, Peru. 2.4x 2.4x 2.4 (max dimensions)
Dodecahedron- Magma Mine, Arizona, USA 2.7x 2.6x 2.4 cm.  















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Click here to see the new Clearance Minerals (new specimens on pages 1 & 2). New Sept 29, 2014