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Crocodile Jasper

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Name:
The name "crocodile jasper" is said to refer to the stone's resemblance to amphibian eyes.
It is also known as Kabamba Jasper or aka Kabamba Jasper.
A tradename for a greenish colored volcanic rhyolite rock quarried by Norcross- Madagascar in a 6 km2 large area in Madagascar (probably in the Tsiroanomandidy area, but this is not been verified).

It is commonly, though erronously, sold as jasper or as a stromatolitic rock, which it is not.

The EPI-Institute in Germany has studied the rock by thin section and XRD. The greenish colored rock consist of the minerals quartz, pyroxene (aegirine), albite, and K feldspar. The characteristic, blackish, rounded aggregates consist of needles of amphiboles (riebeckite to paragasite in composition).

See also messageboard at https://www.mindat.org/forum.php?read,62,421984,422090#msg-422090


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Classification of Crocodile JasperHide

Mineralogy of Crocodile JasperHide

Essential minerals - these are minerals that are required within the classification of this rock:
AmphiboleAX2Z5((Si,Al,Ti)8O22)(OH,F,Cl,O)2
Feldspar > Alkali Feldspar > AlbiteNa(AlSi3O8)
Feldspar > Alkali Feldspar > K FeldsparPotassium-dominant feldspars with unknown crystal symmetry and Al-Si ordering state.
Pyroxene > Clinopyroxene > AegirineNaFe3+Si2O6
Silica > QuartzSiO2

Pronounciation of Crocodile JasperHide

Pronounciation:
PlayRecorded byCountry
Jolyon RalphUnited Kingdom

Synonyms of Crocodile JasperHide

References for Crocodile JasperHide

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Internet Links for Crocodile JasperHide

 
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