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Afwillite With Ettringite & Hydrocalumite

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AMM1169757

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Description
Locality: 
Boisséjour, Ceyrat, Clermont-Ferrand, Puy-de-Dôme, Auvergne-Rhône-Alpes, France
Class: 
Crystals on Matrix
Size Range: 
Small cabinet (7-10 cm)
Size: 
7 × 4.5 × 4 cm
Description

Fine and large specimen completely covered with colourless afwillite aggregates, white columnar ettringite and some platy hydrocalumite crystals. The afwillite aggregates forms transparent spray-like aggregates, whereas ettringite forms columnar white crystals. The hydrocalumite crystals are platy showing a good transparency. This is a great combination of three interesting minerals. Large specimen size.

The specimen comes from the collection of Dr. G. Jung, who received it in 1975.

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This auction exclusively features large collection specimens, with a minimum size of 3 centimetres (most pieces are significantly larger). These are exceptional or unusual collection specimens from times gone by, some with historical labels and, in most cases, with detailed information about their previous owners and other interesting facts.

Mineral Data
What's on the rock

Afwillite

Formula: 
Ca3(HSiO4)2·2H2O
Strunz: 
9.AG.75
Crystal System: 
Monoclinic:
Hardness: 
3.0 - 4.0
Streak: 
White
Type Locality: 
Dutoitspan Mine, Kimberley, Francis Baard District, Northern Cape Province, South Africa

Ettringite

Formula: 
Ca6Al2(SO4)3(OH)12·26H2O
Strunz: 
7.DG.15
Hardness: 
2.0 - 2.5
Type Locality: 
Ettringer Feld, Western lava flow, Bellerberg volcano, Ettringen, Mayen, Eifel, Rhineland-Palatinate, Germany

Hydrocalumite

Formula: 
Ca4Al2(OH)12(Cl,CO3,OH)2·4H2O
Strunz: 
4.FL.10
Hardness: 
3.0
Type Locality: 
Scawt Hill, Larne, Co. Antrim, Northern Ireland, UK

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$10
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Shipping Information

Postage Area Price
Germany (insured parcel)
€6.50
Worldwide (tracked)
€10
USA (tracked)
€12
USA (tracked, > 0,5 kg)
€22
European Union (tracked, > 1 kg)
€18
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Combined shipping of multiple specimens is standard after full payment.

Multiple pieces may incur increased postage costs due to higher weight. 

For questions about shipping or possible costs, feel free to contact me: 

[email protected]

Seller Information

Payment options: offline, paypal_wpp, paypal_wps

Seller's terms and conditions

Accepted payment methods: PayPal, bank transfer.

Money back guarantee is valid until 14 days after receiving the payment. The refund will be initiated immediately upon receiving the minerals back. Due to the return time, there may be a delay in the refund. 

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