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Willemite Calcite & Mimetite

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MNT18573

Willemite Calcite & Mimetite

Ex H-J Wilke (Germany)

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Description
Locality: 
Chah Milleh Mine, Anarak District, Nain County, Isfahan Province, Iran
Size Range: 
Miniature (4.5-7 cm)
Size: 
5.7 × 3.8 × 1.6 cm
Description

This is an interesting one: willemite pseudomorphs/perimorphs after cerussite (?).
In mindat.org there is an entry from John Betts that similar type of material is descloizite after cerussite, I microscoped this specimen and XRD´d other ones from this lot: NO descloizite, clearly willemite.

Powdered by brownish-orange mimetite crusts and accompnaied by some whitish calcite crytals (flat rhombohedrons) Other secondary minerals may be present, but not tested.

Very interesting specimen and a hard to get one of course.

Mineral Data
What's on the rock

Willemite

Formula: 
Zn2SiO4
Strunz: 
9.AA.05
Hardness: 
5.5
Streak: 
White
Type Locality: 
Vieille Montagne (Altenberg; Kelmisberg), Moresnet, Kelmis, Plombières-Vieille Montagne District (Plombières-Altenberg), Verviers, Liège Province, Belgium

Calcite

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

Mimetite

Formula: 
Pb5(AsO4)3Cl
Strunz: 
8.BN.05
Crystal System: 
Hexagonal
Hardness: 
3.5 - 4.0
Streak: 
White
Type Locality: 
Treue Freundschaft Mine, Johanngeorgenstadt, Johanngeorgenstadt District, Erzgebirge, Saxony, Germany

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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