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Eglestonite & Calomel

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CR992509

Eglestonite & Calomel

Rare Mineral

Description Tabs

Description
Locality: 
Mariquita Mine, Usagre, Badajoz, Extremadura, Spain
Class: 
Crystals on Matrix
Size Range: 
Miniature (4.5-7 cm)
Size: 
4.5 × 3 × 2 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.

Very rich specimen from a long time closed mine in Spain.

With white to grey crystallized calomel (picture 4-6)

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