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I have some collection of quartz and rock for identification

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asked Feb 21, 2017 by santoshmlokhande (850 points)

2 Answers

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From top to bottom, 3,5 and 6 are quartz. They will be very hard. That last one looks like ruby or garnet, also very hard. Numer 4 looks like a fossil embedded in rock, I can even see agate in there; the fossil looks like a fossil called a replacement fossil where the structure of the fossil is replaced by minerals in the environment. This happens in petrified wood and plants where the biological matter is replaced by minerals which have now become fossils also shellfish and regular animal fossils.

Number one and two are interesting. Two could be quartz but the striations in the crystal lattice are different from the others in 3,5 and 6

Blue minerals are not too numerous but I will have to look into this a little bit.
answered Feb 22, 2017 by Weasel (58,940 points)
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It's very difficult to identify minerals with just a picture without any background information, which you failed to provide. However, certain common minerals such as quartz can be easily identified even by photo alone. With that said, here is my response:

1. Although it looks like it could be lazulite, its hard to tell from the photo, would need to be viewed in person or tested.

2. Looks most like pectolite, but can be a type zeolite or other radiating mineral such as wollastonite. Again, not really possible to positively identify without more background.

3. Crystal habits indicate a most likely assumption of quartz.

4. Too hard to tell.

5 and 6. Also looks most like quartz

7. Picture is blurry and only partial, but jasper would be a likely assumption.
answered Apr 27, 2017 by hershel (52,800 points)