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Tiptopite Roscherite Hurlbutite & Robertsite

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BCK820931

Tiptopite Roscherite Hurlbutite & Robertsite

Dan Behnke 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: 
2.4 × 1 × 1 cm
Description

You are bidding on a rich and fantastic example with nice, complete sprays of hexagonal tiptopite crystals with red roscherite clusters, brown spheres of robertsite plates, milky white hurlbutite spheres and whitlockite. Very rich sample originally collected by Thomas Campbell. Comes with 6 slides taken by Dan and the original collection index card. 

This sample is from the collection of Dan Behnke, long-time friend, micromounter and prodigious photographer. I am pleased to be able to offer selections from his large collection, many of which are illustrated specimens in Rocks & Minerals, The Mineralogiocal Record, Photo Atlas of Minerals and many other publications. All samples from his meticulously catalogued collection will come with his original index card with all notes, photography annotations and other pertinent information, as well as any slides Dan may have taken of the sample with publication notes and date the photo was made.

Mineral Data
What's on the rock

Tiptopite

Formula: 
K2(Na,Ca)2Li3Be6(PO4)6(OH)2·H2O
Strunz: 
8.DA.25
Hardness: 
3.5
Type Locality: 
Tip Top Mine (Tip Top pegmatite), Fourmile, Custer District, Custer Co., South Dakota, USA

Roscherite

Formula: 
Ca2Mn2+5Be4(PO4)6(OH)4·6H2O
Strunz: 
8.DA.10
Crystal System: 
Monoclinic Tabular crystals or platy aggregates
Hardness: 
4.5 - 0.0
Streak: 
White
Type Locality: 
Greifenstein Rocks, Ehrenfriedersdorf, Erzgebirge, Saxony, Germany

Hurlbutite

Formula: 
CaBe2(PO4)2
Strunz: 
8.AA.15
Crystal System: 
Orthorhombic
Hardness: 
6.0
Streak: 
White
Type Locality: 
Chandlers Mill Quarry, Newport, Sullivan Co., New Hampshire, 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

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Start 07 Jan 18:00
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