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Opal-CT

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QRI905367

Opal-CT

Former collection Christian Mavris
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Description Tabs

Description
Locality: 
Case Montanini Quarry, Sant'Andrea Bagni, Parma Province, Emilia-Romagna, Italy
Class: 
Crystals on Matrix
Size Range: 
Cabinet (10-18 cm)
Size: 
12.2 × 9.8 × 6.7 cm
Largest Crystal: 
0.20cm
Weight: 
621.00gr
Description

Rich specimen featuring a dozen of white-blueish 'teardrops' of opal-CT on oxide stained siltite matrix. Back in 2005, as part of my M.Sc., I have personally analysed specimens from the same find with Raman, SEM-EDX and optical microscopy, and the specimens revealed it being the cristobalite-tridymite (CT) type.
Unusually seen on the international market, these specimens came for a limited time at the Italian mineral shows in the late 2000s, and became progressively scarcer ever since.

In my collection since 2005. 

Mineral Data
What's on the rock

Opal-CT

Variety Of: 

Opal

Formula: 
SiO2·nH2O
Strunz: 
4.DA.10
Hardness: 
5.5 - 6.5
Formula: 
SiO2·nH2O
Hardness: 
0.0

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