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Connellite & Aurichalcite

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RSG1163576

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Description
Locality: 
Madonna di Fucinaia Slag Locality, Campiglia Marittima, Campigliese, Livorno Province, Tuscany, Italy
Class: 
Crystals on Matrix
Size Range: 
Thumbnail (1-3cm)
Size: 
1 × 1.7 × 1.2 cm
Description

This specimen exhibits superb connellite Cu₁₉Cl₄(SO₄)(OH)₃₂·3H₂O forming deep ultramarine-blue botryoidal aggregates lining a cavity in the host rock. The globules display a smooth to silky luster, with locally visible radiating acicular microcrystals revealing the internal fibrous structure. Whitish crusts and associated microcrystals (likely aurichalcite or Cu–Zn carbonates) indicate formation in an advanced oxidation environment.

The Madonna di Fuciniai locality in Italy is famous for intensely colored secondary copper minerals, and especially for connellite occurring as vivid blue botryoidal spheres, a morphology much rarer than the usual needle-like sprays

In a box 2.8x2.8cm, labelled

FoV : 2.8mm

Mineral Data
What's on the rock

Connellite

Formula: 
Cu19(SO4)(OH)32Cl4·3H2O
Strunz: 
3.DA.25
Crystal System: 
Hexagonal
Hardness: 
3.0
Type Locality: 
Wheal Providence, Providence Mines, Carbis Bay, St Ives, St Ives District, Cornwall, England, UK

Aurichalcite

Formula: 
(Zn,Cu)5(CO3)2(OH)6
Strunz: 
5.BA.15
Crystal System: 
Monoclinic - Prismatic
Hardness: 
1.0 - 2.0
Type Locality: 
Loktevskoye Mine (Loktevskii Mine), Upper Loktevka River, Rudnyi Altai, Altaiskii Krai, Western-Siberian Region, Russia

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Start 28 Jan 18:00
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