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Wiluite & Achtaragdite

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MNT133569

Wiluite & Achtaragdite

ex Dr. F. Krantz (GER), ex?
Type Locality

Description Tabs

Description
Locality: 
Vilui River Basin, Sakha Republic, Russian Federation
Size Range: 
Small cabinet (7-10 cm)
Size: 
8.8 × 5 × 5.5 cm
Description

A really nice old timer example with Wiluite and Achtaragdite, a Hydrogrossular-chlorite-carbonate pseudomorph after very probably Wadalite or some other hydrogarnet. The real protomineral for these pseudomorphoses isn't exactly known up to now. The Achtaragdite is seen as a white earthy pseudocrystal and in whiteish sections through the matrix and there are some deep olive brownish resin lustrous Wiluite crystals (not all complete), the one on top of the specimen is well developed with nice termination. Old material from the Dr. F. Krantz stock.

Mineral Data
What's on the rock

Wiluite

Formula: 
Ca19(Al,Mg)13(B,☐,Al)5(Si2O7)4(SiO4)10(O,OH)10
Strunz: 
9.BG.35
Crystal System: 
Tetragonal
Hardness: 
6.0
Type Locality: 
Vilyui River Basin (Vilui River Basin; Wilui River Basin), Sakha Republic (Saha Republic; Yakutia), Eastern-Siberian Region, Russia

Seller Information

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Seller's terms and conditions

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