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Bentonite & Alstonite

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ESM508584

Bentonite & Alstonite

Description Tabs

Description
Locality: 
Minerva #1 Mine, Cave-in-Rock, Hardin County, Illinois, United States of America
Class: 
Combination
Size Range: 
Small miniature (3-4.5 cm)
Size: 
2.4 × 3.2 × 3.8 cm
Description

Lustrous beige benstonite crystals with sharp white alstonite crystals

Mineral Data
What's on the rock

Bentonite

Mixture Of: 

Clinoptilolite

Montmorillonite

Formula: 
(Na,Ca)0.33(Al,Mg)2(Si4O10)(OH)2·nH2O
Strunz: 
9.EC.40
Hardness: 
1.0 - 2.0

Alstonite

Formula: 
BaCa(CO3)2
Strunz: 
5.AB.35
Crystal System: 
Triclinic
Hardness: 
4.0 - 4.5
Streak: 
White
Type Locality: 
Brownley Hill Mine (Bloomsberry Horse Level), Nenthead, Alston Moor District, North Pennines, North and Western Region (Cumberland), Cumbria, England, UK