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Identity HelpGreen unkown (chlorite?)

4th Dec 2018 21:00 UTCKyle Beucke 🌟

07978690016051682376927.jpg
Hello,


The attached images show an olive green, clay-like mineral that fills voids in altered volcanic rock (possibly andesite). This green blob is ~ 1mm across. There was a lot of (past) hydrothermal activity in the area this was collected.


One of the photographs shows the pale powder resulting from scratching it with a steel pin. It is very soft. The green blobs seem to have a very thin rim of something darker.


Any guesses? Chlorite, perhaps?


Thank you,


Kyle Beucke

04456800015655548163433.jpg

4th Dec 2018 21:08 UTCKeith Compton 🌟 Manager

Being that soft it is possibly one of the smectite group minerals

4th Dec 2018 21:26 UTCAlfredo Petrov Manager

I agree with Keith. A smectite group mineral (nontronite, saponite, etc) is a likely candidate.

5th Dec 2018 22:37 UTCGregg Little 🌟

The waxy lustre and the way if crushes under pressure is typical of the authigenic clay minerals I encounter in the Western Canadian Sedimentary Basin; being commonly kaolinite, montmorillonite, illite, glauconite, etc.
 
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