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1 item @ $125.00  

Montgomeryite with Robertsite

#35301

Montgomeryite with Robertsite

#35301
Availability
Sold
Size
3 x 1.5 x 2.5 cm - Thumbnail 
Formula
Ca4MgAl4(PO4)6(OH)4·12H2O (RRUFF)
Locality
Tip Top mine, Custer Co., South Dakota, United States
Tagged
phosphate

Deep red laths of montgomeryite to about 1mm with good obvious coverage associated with jet black Robertsite.

Montgomeryite

Formula
Ca4MgAl4(PO4)6(OH)4·12H2
Crystal System
Monoclinic 
Cleavage
Perfect, Indistinct, None 
Luster
Vitreous (Glassy) 
Color
colorless, yellowish, white, green, red 
Streak
white 
Class
Monoclinic - Prismatic 
Hardness

Data courtesy of Webmineral.

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