Moving mountains for you
Switch currency

Current Live Auctions

Current Live Fixed Price Sales

Montgomeryite & Robertsite

Views:
Watches:
BCK724546

Montgomeryite & Robertsite

Classic Locality

Description Tabs

Description
Locality: 
Tip Top Mine, Fourmile, Custer County, South Dakota, United States of America
Class: 
Crystals on Matrix
Size Range: 
Miniature (4.5-7 cm)
Size: 
6.6 × 4.2 × 2.6 cm
Description

You are bidding on a small miniature sample with a large vug full of thousands of robertsite crystals with some bright red blades of montgomeryite. On the bottom is a fracture with some small clusters of englishite crystals. 

Mineral Data
What's on the rock

Montgomeryite

Formula: 
Ca4MgAl4(PO4)6(OH)4·12H2O
Strunz: 
8.DH.25
Hardness: 
4.0
Type Locality: 
Clay Canyon, Fairfield, Oquirrh Mts, Utah Co., Utah, USA

Robertsite

Formula: 
Ca3Mn3+4(PO4)3O2·3H2O
Strunz: 
8.DH.30
Hardness: 
3.5
Streak: 
Red-brown
Type Locality: 
Tip Top Mine (Tip Top pegmatite), Fourmile, Custer District, Custer Co., South Dakota, USA

Seller Information

Payment options: offline, paypal_wpp, paypal_wps