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Julgoldite & Copper

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BCK813450

Julgoldite & Copper

Dan Behnke collection
Rare Mineral

Description Tabs

Description
Locality: 
Clark Mine, Copper Harbor, Keweenaw County, Michigan, United States of America
Class: 
Crystals on Matrix
Size Range: 
Thumbnail (1-3cm)
Size: 
1.4 × 1.2 × 0.7 cm
Description

ILLUSTRATED!! You are bidding on a small sample with several vugs in prehnite hosting small blades of brownish-green julgoldite crystals with small crystals of native copper. This is one of Dan's proudest finds as it was a new species from Michigan and the USA at the time he found it. Identified by Pete Dunn and assumed to be julgoldite-Fe+3 by Dan's notes. Illustrated in Mineralogical Record 7/83 p.222. Comes with 5 original slides and index cards. Only four samples were found! 

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

Julgoldite

Synonym Of: 

Julgoldite-(Fe2+)

Formula: 
Ca2(Fe2+,Mg)(Fe3+,Al)2(Si2O7)(SiO4)(OH)2·H2O
Strunz: 
9.BG.20
Hardness: 
0.0

Julgoldite-(Fe3+)

Formula: 
Ca2(Fe3+,Mg)(Fe3+,Al)2(Si2O7)(SiO4)(OH,O)2·H2O
Strunz: 
9.BG.20
Hardness: 
4.5

Julgoldite-(Mg)

Formula: 
Ca2(Mg,Fe2+)(Fe3+,Al)2(Si2O7)(SiO4)(OH)2·H2O
Strunz: 
9.BG.20
Hardness: 
0.0
Group Parent: 
Pumpellyite Group

Copper

Formula: 
Cu
Strunz: 
1.AA.05
Crystal System: 
Isometric
Hardness: 
2.5 - 3.0

Seller Information

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