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Alunogen & Pickeringite

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PDM670984

Alunogen & Pickeringite

Floater

Description Tabs

Description
Locality: 
Libros Sulphur Mines, Libros, Teruel, Aragón, Spain
Class: 
Crystal Group/Cluster
Size Range: 
Miniature (4.5-7 cm)
Size: 
5.6 × 4 × 2.6 cm
Description

A floater aggregate of white fibrous alunogen-pickeringite with yellow microcrystals of sulphur. From the historical sulphur mines of Libros (Teruel), a Late Miocene lacustrine-hosted biota deposit, well-known by the world-class fossilized frogs.

Found in the 1960’s. Ex. M. Moreno specimen.

Mineral Data
What's on the rock

Alunogen

Formula: 
Al2(SO4)3·17H2O
Strunz: 
7.CB.45
Crystal System: 
Trigonal
Hardness: 
1.5 - 2.0
Streak: 
White

Pickeringite

Formula: 
MgAl2(SO4)4·22H2O
Strunz: 
7.CB.85
Hardness: 
1.5 - 2.0
Type Locality: 
Cerros Pintados ("Cerro Pintados"), Pampa del Tamarugal, El Tamarugal Province, Tarapacá Region, Chile...

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