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Eglestonite On Calomel

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CR974146

Eglestonite On Calomel

Rare Mineral

Description Tabs

Description
Locality: 
Mariquita Mine, Usagre, Badajoz, Extremadura, Spain
Class: 
Crystals on Matrix
Size Range: 
Thumbnail (1-3cm)
Size: 
2.1 × 1.4 × 1.3 cm
Description

Eglestonite is a rare mercury chloride and specimens from any worldwide locality are very rare.

This specimen hosts lustrous, yellow-brown crystals of eglestonite - named after Thomas Egleston who founded the School of Mines at Columbia University in 1864 and was Professor of Mineralogy and Metallurgy until he retired in 1897.

This specimen host a sharp and lustous honeybrown eglestonite crystal on a bed of calomel crystals.

Mineral Data
What's on the rock

Eglestonite

Formula: 
(Hg2+2)3OCl3(OH)
Strunz: 
3.DD.05
Crystal System: 
Isometric
Hardness: 
2.5
Type Locality: 
Terlingua District, Brewster Co., Texas, USA

Calomel

Formula: 
(Hg2+2)Cl2
Strunz: 
3.AA.30
Hardness: 
1.5 - 2.0
Type Locality: 
Landsberg (Moschellandsberg), Alsenz-Obermoschel, Palatinate, Rhineland-Palatinate, Germany