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Goethite Psm Siderite On Quartz & Schorl

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SMS1150901

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Description
Locality: 
Erongo Mountains, Karibib, Erongo Region, Namibia
Class: 
Crystal Group/Cluster
Size Range: 
Cabinet (10-18 cm)
Size: 
11.5 × 8.6 × 4.1 cm
Weight: 
275.45gr
Description

The specimen consists of a 'brut' cluster of quartz on schorl with numerous schorl needles penetrating the quartz. The formation has a few scattered little concentrations of shallow bladed crystals of goethite psm siderite that were on their way tp forming rosettes. The tapering quartz crystals are opaque and marbled with milky grey, mid grey and dark grey zones.

Mineral Data
What's on the rock

Goethite

Formula: 
α-Fe3+O(OH)
Strunz: 
4.00.
Crystal System: 
Orthorhombic
Hardness: 
5.0 - 5.5
Type Locality: 
Hollertszug Mine (Hollerter Zug Mine), Dermbach, Herdorf, Siegerland, Rhineland-Palatinate, Germany

Siderite

Formula: 
FeCO3
Strunz: 
5.AB.05
Crystal System: 
Trigonal
Hardness: 
3.5 - 4.5
Streak: 
White

Quartz

Formula: 
SiO2
Strunz: 
4.DA.05
Crystal System: 
Trigonal
Hardness: 
7.0
Streak: 
White

Schorl

Formula: 
Na(Fe2+3)Al6(Si6O18)(BO3)3(OH)3(OH)
Strunz: 
9.CK.05
Hardness: 
7.0

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Postage Area Price
Europe up to 500 grams
$12
Europe up to 1 kilogram
$16
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$14
United States up to 1 kilogram
$18
Rest of world up to 500 grams
$14
Rest of world up to 1 kilogram
$18
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