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Hendricksite Andradite & Calcite

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MNT70815

Hendricksite Andradite & Calcite

Ex Dr F Krantz (Bonn Germany), Ex Mineral Unlimited
Type Locality

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Description
Locality: 
Franklin, Sussex County, New Jersey, United States of America
Size Range: 
Cabinet (10-18 cm)
Size: 
10.5 × 6.5 × 5 cm
Description

A 515 g heavy chunk of Franklin material consisting of intergrown garnet (brownish, called polyadelphite, a variety of andradite), blackish hendricksite (on the label as manganophyllite, but was recognized later as an own species) and white calcite. A type locality specimen probably from the mid 20th century, from Minerals Unlimited (David B. Grigsby & Scott J. Williams). Quite an interesting specimen and not so common combo.

Mineral Data
What's on the rock

Hendricksite

Formula: 
K(Zn,Mg,Mn2+)3(AlSi3O10)(OH)2
Strunz: 
9.EC.20
Hardness: 
0.0
Type Locality: 
Buckwheat pit (Southwest opening; Buckwheat Mine), Franklin Mine, Franklin, Franklin Mining District, Sussex Co., New Jersey, USA

Andradite

Formula: 
Ca3Fe3+2(SiO4)3
Strunz: 
9.AD.25
Crystal System: 
Isometric
Hardness: 
6.5 - 7.0
Streak: 
White
Type Locality: 
Drammen, Buskerud, Norway

Calcite

Polymorph of: 
Aragonite and Vaterite
Formula: 
CaCO3
Strunz: 
5.AB.05
Crystal System: 
Trigonal
Hardness: 
3.0
Streak: 
White

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Thank you for your interest in my offers! Payment is possible via Paypal, bank transfer or cash if you pick up the item(s) personally. Bank data will be provided after settling the auction/transaction(s) if needed.

In case you are not happy with a specimen, you may send it back within 4 weeks. After receipt, i will refund the price minus shipping costs. Please inform me before sending an item back. If you have any questions (or maybe complaints) please feel free to contact me.

Best regards Roger

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