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Boracite & Hilgardite On Magnesite

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GND40491

Boracite & Hilgardite On Magnesite

Classic Locality

Description Tabs

Description
Locality: 
Boulby Mine, Loftus, North Yorkshire, United Kingdom
Size Range: 
Small cabinet (7-10 cm)
Size: 
7.2 × 3.8 × 2.5 cm
Description

An interesting specimen that features rounded cream coloured balls of chalky magnesite covered with pale green coloured micro crystals of boracite and pale pink hilgardite.

Displays well and is in excellent condition apart from some contacting of the magnesite on the base.

Mineral Data
What's on the rock

Boracite

Formula: 
Mg3(B7O13)Cl
Strunz: 
6.GA.05
Crystal System: 
Orthorhombic
Hardness: 
7.0 - 7.5
Streak: 
White
Type Locality: 
Lüneburger Kalkberg, Lüneburg, Lower Saxony, Germany

Hilgardite

Formula: 
Ca2B5O9Cl·H2O
Strunz: 
6.ED.05
Hardness: 
5.0
Streak: 
White
Type Locality: 
Choctaw Salt Dome (Bayou Choctaw Salt Dome), Plaquemine, Iberville Parish, Louisiana, USA

Magnesite

Formula: 
MgCO3
Strunz: 
5.AB.05
Crystal System: 
Trigonal
Hardness: 
3.5 - 4.5
Streak: 
White
Type Locality: 
Magnisía Prefecture (Magnesia), Thessalia Department (Thessaly), Greece
Gondwana Minerals