Moving mountains for you
Switch currency

Current Live Auctions

Current Live Fixed Price Sales

Pararobertsite & Whitlockite

Views:
Watches:
BCK662516

Pararobertsite & Whitlockite

Kay Robertson collection
Type Locality

Description Tabs

Description
Locality: 
Tip Top Mine, Fourmile, Custer County, South Dakota, United States of America
Class: 
Crystals on Matrix
Size Range: 
Thumbnail (1-3cm)
Size: 
1.6 × 1.2 × 0.8 cm
Description

You are bidding on a small sample with some exceptional prismatic crystals of pararobertsite on whitlockite from the type locality. This is material that was collected and not realized was pararobertsite until much later after analysis by Steve and Janey Cares. The triangular notches on the prism face and more square outline of the cross-section of the crystal versus the typical pseudohexagonal aspect of robertsite give it away. These were very rare specimens! Kay Robertson collection and label. 

Mineral Data
What's on the rock

Pararobertsite

Formula: 
Ca2Mn3+3(PO4)3O2·3H2O
Strunz: 
8.DH.30
Crystal System: 
Monoclinic
Hardness: 
2.0
Streak: 
Brown Red
Type Locality: 
Tip Top Mine (Tip Top pegmatite), Fourmile, Custer District, Custer Co., South Dakota, USA

Whitlockite

Formula: 
Ca9Mg(PO4)6(HPO4)
Group Parent: 
Whitlockite Group
Strunz: 
8.AC.45
Crystal System: 
Trigonal
Hardness: 
5.0 -
Colour: 
Colourless, grey-white, light pink, light yellow; colourless in transmitted light
Type Locality: 
Palermo No. 1 Mine Grafton County, New Hampshire, USA

Seller Information

Payment options: offline, paypal_wpp, paypal_wps