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Neptunite & Benitoite

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MNT79298

Neptunite & Benitoite

Ex Dr F Krantz (Bonn Germany) - no old label
Classic Locality

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Description
Locality: 
Benitoite Mine, San Benito County, California, United States of America
Size Range: 
Miniature (4.5-7 cm)
Size: 
5.1 × 1.7 × 2.1 cm
Description

Very nice example of well developed black neptunite with a small blue benitoite crystal (incomplete) attached on/in white natrolite on matrix. The natrolite has been removed in part chemically as usual with these specimens (muriatic acid). Quite a good one from the Krantz stock, no old label.

Mineral Data
What's on the rock

Neptunite

Formula: 
Na2KLi(Fe2+,Mn2+)2Ti2(Si8O24)
Strunz: 
9.EH.05
Hardness: 
5.0 - 6.0
Colour: 
Black
Type Locality: 
Narsaarsuk pegmatite (Narssârssuk pegmatite), Narsaarsuk Plateau, Igaliku (Igaliko), Narsaq, Kujalleq, Greenland

Benitoite

Formula: 
BaTi(Si3O9)
Strunz: 
9.CA.05
Crystal System: 
Hexagonal
Hardness: 
6.0 - 6.5
Type Locality: 
California State Gem Mine (Dallas Gem Mine; Benitoite Mine; Benitoite Gem Mine; Gem Mine), Dallas Gem Mine area, San Benito River headwaters area, New Idria District, Diablo Range, San Benito Co., California, USA

Seller Information

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Terms & Conditions

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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