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Robertsite & Whitlockite

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PPM1067072

Robertsite & Whitlockite

Ex. Kenny Gay Collection, Ex. Willard "Bill" Roberts Collection

Description Tabs

Description
Locality: 
Tip Top Mine, Fourmile, Custer County, South Dakota, United States of America
Class: 
Combination
Size Range: 
Thumbnail (1-3cm)
Size: 
2.7 × 2.2 × 2.3 cm
Description

Excellent thumbnail specimen of rich microcrystals of robertsite and whitlockite from the famous Tip Top pegmatite in Custer, South Dakota! Has a great provenance, with a label from the collection of the person the mineral was named after, Willard "Bill" Roberts of the South Dakota School of Mines! Much better in person, please pardon my photos! Has beautiful well-formed whitlockite and robertsite crystals all over the specimen, just beautiful under the microscope. Ex. Kenny Gay collection. Rare! 

Mineral Data
What's on the rock

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

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
Labels
Label Images - only: Robertsite & Whitlockite
Label Images - only: Robertsite & Whitlockite
Label Images - only: Robertsite & Whitlockite
Label Images - only: Robertsite & Whitlockite

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