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Richard
I would be very grateful for any help in identifying these minerals. 

The first is 10 cm across and the 'yellow' crystals are more white than the photo shows.

DSC02944.jpg 
The second is 15 cm across

DSC02946.jpg 
The third is 6 cm across - top view and side view

DSC02948.jpg

DSC02949.jpg 
Thank you   


Richard
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Hydrangea

Hi Richard - it's very difficult to identify minerals just from a photo, but I'll have a go.

First one looks like sphalerite (the dark mineral), calcite (the white mineral) with a thin coat of greenockite (the yellow mineral).

Second one again looks like sphalerite,  not sure what the white mineral could be.

Last one probably man made carborundum.
Roy D.
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Richard
Hi Roy
Many thanks for your reply
Specimen 1 - I measured / estimated its density which does correspond with sphalerite. As I mentioned the photo exaggerated the yellow colour. I did wonder if it was sulphur but it has no smell. 
Specimen 2 - ditto for its density - close up the white crystals appear to be quartz?
Specimen 3 - Carborundum - I have always assumed that this specimen was a natural mineral and now wonder if it belongs in my collection?
Once again, many thanks
Richard
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Hydrangea
 
You're welcome Richard.

Specimen 2 white mineral may be quartz - it should scratch glass.

I'm fairly sure number 3 is carborundum, have a search for carborundum images to compare. Interesting stuff anyway.
Roy D.
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