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Identity HelpUnknown specimen

2nd Mar 2014 20:06 UTCGeorge deWit Chaney

Found in dartmoor on a rocky cliff, i found this on a rocky cliff just by chance in 2009 when I around 10 or 11. I've concluded this to have a vitreous lustre and most probably a silicate, clear crystals are transparent and has a similar surface to glass. It does have cleavage from close inspection and has colour tint to slight brown/red, most probably iron oxide? The clear crystals form hexagonal prisms as are terminated. I haven't really tested the hardness. Crystals are on very hard stony rock ground mass which is heavy. It's nothing amazing and I'm fairly sure what it may be but not enough to be sure. I'd like to hear from anyone on what they think from my information. I will put the pics on another topic as it wont fit on this one. Thank you for your time :-)

2nd Mar 2014 20:11 UTCGeorge deWit Chaney

Somewhat cannot fit a picture on separate topic or this one, still tell me what you think if you can.

2nd Mar 2014 20:22 UTCPhil M. Belley Expert

Sounds like quartz crystals, though quartz has no cleavage. Try resizing the photos to 800 pixels or so and posting on this topic.

2nd Mar 2014 23:38 UTCVolkmar Stingl

Or calcite, which has a cleavage.
 
and/or  
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