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Gypsum var. selenite with Quartz

#AH52771
Gypsum from Naica, Mun. de Saucillo, Chihuahua, Mexico - AH52771
Gypsum from Naica, Mun. de Saucillo, Chihuahua, Mexico - AH52771

Gypsum var. selenite with Quartz

#AH52771
Availability
Available
Price
$125.00
Size
15 x 8 x 6 cm - Cabinet 
Formula
CaSO4·2H2O (RRUFF)
Locality
Naica, Mun. de Saucillo, Chihuahua, Mexico

Large excellent crystal with a fine coating of iron oxide. Without this coating, the specimen would be waterclear. I don't know if it is possible to remove the coating, however, without damage to the crystal. There are overgrowths of Quartz clusters resembling pineapples. The third from the last photo shows an imprint from one of these clusters.  A near perfect specimen which shows virtually no damage. It is nearly perfect.

Gypsum

Formula
CaSO4·2H2O 
Crystal System
Monoclinic 
Crystal Habit
Tabular, Crystalline - Coarse, Massive - Fibrous 
Cleavage
Perfect, Distinct, Distinct 
Luster
Pearly 
Color
white, colorless, yellowish white, greenish white, brown 
Streak
white 
Class
Monoclinic - Prismatic 
Fracture
Fibrous 
Hardness
2 

Data courtesy of Webmineral.

Collection
Arnold G Hampson Collection
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