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Yellow octahedral fluorite crystals
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Jordi Fabre
Overall coordinator of the Forum

Joined: 07 Aug 2006
Posts: 5111
Location: Barcelona

Posted: Jun 04, 2012 02:05 Post subject: Re: Yellow octahedral fluorite crystals

xenolithos wrote:

Here is another Riemvasmaak example of the partial cuboid yellow overgrowths on green octahedral tips to puzzle over...

Let me it add that the yellowish color seems to me to be more due to some tint of iron oxide intrusions than a real yellow color of the Fluorite.

Duncan Miller

Joined: 25 Apr 2009
Posts: 138
Location: South Africa

Posted: Jun 04, 2012 04:00 Post subject: Re: Yellow octahedral fluorite crystals

Jordi Fabre wrote:

Let me it add that the yellowish color seems to me to be more due to some tint of iron oxide intrusions than a real yellow color of the Fluorite.

Hi Jordi - It may not show on the photos, but you will have to take it from me that the cuboid crystals actually are yellow right through, and surely any iron staining would have stained the green fluorite too. I no longer have free access to facilities to do trace element analysis but Bruce Cairncross published some trace element analyses of Riemvasmaak fluorites and there were multiple potential colouring agents. I don't know if he compared green and yellow crystals.
Duncan

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