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Heulandite-Ca With Hornblende

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CLB99267

Heulandite-Ca With Hornblende

Classic Locality

Description Tabs

Description
Locality: 
Fassa Valley, Trento Province, Trentino-Alto Adige, Italy
Size Range: 
Small cabinet (7-10 cm)
Size: 
7.5 × 5.7 × 4.7 cm
Description

A nice double-sided specimen with two major vugs, containing dozens of very nice, red heulandite-ca crystals and some unidentified colorless-greenish crystals (prehnite? calcite?). Hornblende (augite?) in the matrix. You very rarely see a vuggy specimen like this.

Mineral Data
What's on the rock

Heulandite-Ca

Formula: 
(Ca,Na)2-3Al3(Al,Si)2Si13O36·12H2O
Strunz: 
9.GE.05
Hardness: 
3.5 - 4.0
Streak: 
White
Type Locality: 
Strathclyde (Dunbartonshire), Scotland, UK

Hornblende

Synonym Of: 

Ferro-hornblende

Formula: 
☐{Ca2}{Fe2+4Al}(AlSi7O22)(OH)2
Strunz: 
9.DE.10
Hardness: 
5.0 - 6.0

Magnesio-hornblende

Formula: 
☐{Ca2}{Mg4Al}(AlSi7O22)(OH)2
Strunz: 
9.DE.10
Hardness: 
5.0 - 6.0

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