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Cuatrocapaite-(NH4) & Lucabindiite

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CR838050

Cuatrocapaite-(NH4) & Lucabindiite

rare minerals - SEM/EDS confirmed
New Mineral type

Description Tabs

Description
Locality: 
Torrecillas Mine, Salar Grande, Iquique Province, Tarapacá Region, Chile
Class: 
Crystals on Matrix
Size Range: 
Miniature (4.5-7 cm)
Size: 
4.7 × 3.2 × 2.7 cm
Description

From a small, very limited find: Lots of well developed tabular silky white hexagonal crystals of the new mineral species cuatrocapaite-(NH4), IMA2018-083, with minor larger greyish to colorless hexagonal crystals of rare lucabindiite.

With silvergrey metalic native arsenic.

Analyzed specimen

Mineral Data
What's on the rock

Cuatrocapaite-(NH4)

Formula: 
(NH4)3(NaMg☐)(As2O3)6Cl6·16H2O
Crystal System: 
Trigonal
Colour: 
White
Type Locality: 
Torrecillas mine, Salar Grande, Iquique Province, Tarapacá Region, Chile

Lucabindiite

Formula: 
(K,NH4)As4O6(Cl,Br)
Hardness: 
0.0
Streak: 
white
Type Locality: 
La Fossa crater, Vulcano Island, Lipari, Eolie Islands (Aeolian Islands), Messina Province, Sicily, Italy