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Montgomeryite with Hurlbutite

#BN55088
SOLD
Montgomeryite from Tip Top mine, Custer Co., South Dakota, United States - BN55088
Montgomeryite from Tip Top mine, Custer Co., South Dakota, United States - BN55088

Montgomeryite with Hurlbutite

#BN55088
Availability
Sold
Size
10 x 7 x 2.5 cm - Cabinet 
Formula
Ca4MgAl4(PO4)6(OH)4·12H2O (RRUFF)
Locality
Tip Top mine, Custer Co., South Dakota, United States
Tagged
phosphate , pegmatite mineral

An excellent specimen with rich coverage of bead-like, colorless Hurlbutite, red groups of lath-like Montgomeryite to about 0.75mm, dark red Roberite and/or Mitridatite (green) and minor Englishite.

Montgomeryite

Formula
Ca4MgAl4(PO4)6(OH)4·12H2O 
Crystal System
Monoclinic 
Cleavage
Perfect, Indistinct, None 
Luster
Vitreous (Glassy) 
Color
colorless, yellowish, white, green, red 
Streak
white 
Class
Monoclinic - Prismatic 
Hardness
4 

Data courtesy of Webmineral.

Collection
Dr. Buford Nichols Collection
Mineralpedia
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On Dakota Matrix
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On Dakota Matrix
Other Available Montgomeryite
WebMineral
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Mindat
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