🔎 UNIDENTIFIED Green Quartz? Madagascar

[fuss]

These green crystals I thought were Quartz initially but the terminations look unfamiliar. The white/clear matrix is for sure Quartz, and the piece is from Madagascar where the Ocean Jasper is mined, in fact this was part of a low grade sample of Ocean Jasper and it has some Chalcedony on the back side of it.

Hardness of the crystals is 6-7, no UV reaction, no streak color, no acid reaction. It must be quartz, maybe just an interesting growth with some element giving it green color?

 

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[Steve1236]

View attachment 2011614 View attachment 2011615 View attachment 2011616 View attachment 2011617 These green crystals I thought were Quartz initially but the terminations look unfamiliar. The white/clear matrix is for sure Quartz, and the piece is from Madagascar where the Ocean Jasper is mined, in fact this was part of a low grade sample of Ocean Jasper and it has some Chalcedony on the back side of it.

Hardness of the crystals is 6-7, no UV reaction, no streak color, no acid reaction. It must be quartz, maybe just an interesting growth with some element giving it green color?

The crystal formations look like calcite I have found before, not expert on psuedomorph but maybe quartz after calcite, just a wild guess, then again, I've come across some strange quartz formations.

 

[blauer]

View attachment 2011614 View attachment 2011615 View attachment 2011616 View attachment 2011617 These green crystals I thought were Quartz initially but the terminations look unfamiliar. The white/clear matrix is for sure Quartz, and the piece is from Madagascar where the Ocean Jasper is mined, in fact this was part of a low grade sample of Ocean Jasper and it has some Chalcedony on the back side of it.

Hardness of the crystals is 6-7, no UV reaction, no streak color, no acid reaction. It must be quartz, maybe just an interesting growth with some element giving it green color?

Looks like calcite to me.

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[NJearthman]

Dogtooth calcite

 

[Clay Diggins]

View attachment 2011614 View attachment 2011615 View attachment 2011616 View attachment 2011617 These green crystals I thought were Quartz initially but the terminations look unfamiliar. The white/clear matrix is for sure Quartz, and the piece is from Madagascar where the Ocean Jasper is mined, in fact this was part of a low grade sample of Ocean Jasper and it has some Chalcedony on the back side of it.

Hardness of the crystals is 6-7, no UV reaction, no streak color, no acid reaction. It must be quartz, maybe just an interesting growth with some element giving it green color?

Quartz crystallizes in more than 100 forms so it definitely could be quartz. Hardness etc. match.

At first sight I thought it might be some of the Madasgar Fuchsite colored quartz but the color seems off and the hardness is too high. Another possibility is Sphene (Titanite) but once again the hardness is too high.

It looks like quartz and it quacks like quartz so I'm gonna go with quartz on this one Fuss. The green could be from the Chlorite group (Chamosite) inclusions or a bunch of other stuff that colors quartz green.

 

[fuss]

You guys are right it looks like it could be Calcite, but don't forget no reaction to HCL, and the hardness is that of Quartz.

 

[fuss]

Clay, Chlorite inclusions sounds reasonable. to me. I do have some Epidote included Quartz from Pakistan that matches the color of this but on those pieces you can see needle shaped xls packed together in the Quartz under high magnification, cant on this though.