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Hilgardite & Boracite

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PDM673245

Hilgardite & Boracite

Description Tabs

Description
Locality: 
Boulby Mine, Loftus, North Yorkshire, United Kingdom
Class: 
Crystals on Matrix
Size Range: 
Small miniature (3-4.5 cm)
Size: 
3.7 × 2.6 × 1.6 cm
Description

A rich and representative specimen of spherical aggregates of pale blue boracite crystals, spotted with salmon-coloured micro crystals of hilgardite on a matrix of whitish cleaved volkovskite?.

Ex. Chris Deroo specimen.

Mineral Data
What's on the rock

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

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

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