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Montroydite with Terlinguaite

#38285

Montroydite with Terlinguaite

#38285
Availability
Sold
Size
2.3 x 1.5 x 1.3 cm - Thumbnail 
Formula
HgO (RRUFF)
Locality
Terlingua dist., Brewster Co., Texas, United States

Platy red crystals of Montroydite and the yellow waxy, translucent crystals, also in veinlets are Terlinguaite. Both identified by XRD.  A good online article can be found here: https://archive.org/details/mercuryminerals00schagoog .

Montroydite

Formula
HgO 
Crystal System
Orthorhombic 
Crystal Habit
Crystalline - Fine 
Cleavage
Perfect, None, None 
Luster
Adamantine 
Color
red, brownish red, brown 
Streak
reddish orange 
Class
Orthorhombic - Dipyramidal 
Fracture
Sectile 
Hardness
1.5-2 

Data courtesy of Webmineral.

Collection
Dr. Georg Gebhard

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