DV21 Achtaragdite
Akhtaragda River mouth, Vilyui River Basin, Saha Republic, Eastern-Siberian Region, Russia
2.2x 2.1x 1.7 cm
$85

A very unusual pseudomorph, I have only seen a few of these for sale, usually labeled as "Feldspar ps. Helvite."  According to Mindat they are actually a combination of minerals after (most likely) a hydrogarnet, though exactly what species has been replaced is unknown.

 

In any case, this is a pretty good example of this rare pseudo... an interesting mineralogical oddity.









Similar Minerals

LWK01 Sphalerite with Quartz
Dal'Negorsk, Primorskiy Kray, Russia
9.2x 6.8x 7.3 cm
$780
URI3 Silver, Copper ps. Cuprite
Poteryaevskoe Mine, Altaiskiy Kray, Western Siberian Region, Russia 5.1x 4.2x 2.8 cm
5.1x 4.2x 2.8 cm
$1200
URI2 Copper ps. Cuprite
Poteryaevskoe Mine, Altaiskiy Kray, Western Siberian Region, Russia 4.9x 4.7x 2.4 cm
4.9x 4.7x 2.4 cm
$0
North America
South America
Africa
Asia/Pacific
Europe
Aquamarines
Pyromorphites
Inner Mongolia
Tourmalines
Fluorite
 
 
Clearance Minerals
Display Aids