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Voltaite & Pickeringite

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SMM642193

Voltaite & Pickeringite

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Description
Locality: 
Grotta dell'Allume, Faraglione Nico, Porto Levante, Vulcano Island, Messina Province, Sicily, Italy
Class: 
Crystals on Matrix
Size Range: 
Thumbnail (1-3cm)
Size: 
2 × 1.5 × 1 cm
Description

Many, black shiny crystals of voltaite and nice white tufts of pikeringite and yellow metavoltine.

Boxed with Label
Mineral Data
What's on the rock

Voltaite

Formula: 
K2Fe2+5Fe3+3Al(SO4)12·18H2O
Strunz: 
7.CC.25
Hardness: 
3.0 - 3.5
Type Locality: 
Solfatara di Pozzuoli, Pozzuoli, Phlegrean Fields, Naples Province, Phlegrean Volcanic Complex, Campania, Italy

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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