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Barwoodite & Kupletskite

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BCK780640

Barwoodite & Kupletskite

Type Locality

Description Tabs

Description
Locality: 
Big Rock Quarry, Granite Mountain, Little Rock, Pulaski County, Arkansas, United States of America
Class: 
Crystals on Matrix
Size Range: 
Small miniature (3-4.5 cm)
Size: 
3.2 × 2.2 × 1.8 cm
Description

You are bidding on a small sample with a vug that is host to a group of very nice tabular, slightly altered barwoodite crystals with small blotches of kupletskite with analcime. The centers of the broken crystals are dark red. From the Henry Delinde collection. 

Mineral Data
What's on the rock

Barwoodite

Formula: 
Mn2+6Nb5+(SiO4)2O3(OH)3
Crystal System: 
Trigonal
Hardness: 
Colour: 
Brownish red
Streak: 
Light orange
Type Locality: 
Big Rock Quarry, Pulaski County, Arkansas, United States of America

Kupletskite

Formula: 
(K,Na)3(Mn,Fe)7Ti2Si8O26(OH)4F
Strunz: 
9.DC.05
Crystal System: 
Triclinic
Hardness: 
4.0
Streak: 
Brown
Type Locality: 
Kuivchorr Mt, Lovozero Massif, Kola Peninsula, Murmanskaja Oblast', Northern Region, Russia...

Seller Information

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