Gyrolite
Silicate group - Phyllosilicate
Formule chimique :
Ca2Si3O7(OH)2.H2O
Système cristallin :
Hexagonal
Etymologie :
From the Greek guros, meaning round, in connection with the characteristic ball-shaped habitus of gyrolite.
Dureté :
3 – 4
Densité :
2.4
Propriétés physiques :
Vitreous and pearly sheen on the cleavage planes. Colour white to brown. Transparent to translucent. Irregular fracture. Perfect cleavage (0001).
Propriétés chimiques :
Soluble in acids.
Formule chimique :
Ca2Si3O7(OH)2.H2O
Habitus :
In globules with a fibrolamellar structure or in lamellae. Often in rosettes or fans.
Gîtologie :
Gyrolite is associated with zeolites in the cavities of basaltic rocks.
Determination :
Easy because of its concentric lamellar ball habit.
Utilisation :
Gyrolite is generally found in dolerite tonsils in the north of Scotland, on the Isle of Skye. Beautiful samples of gyrolite are found from the quarries of Khandivali (India). It can also be found in Iceland, the Faroe Islands and Greenland (Disko Island).
It has never been described in France.
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