Do you know these crystals?

Question

I'm quiet new in the crystal department but have acquiered a small collection. I thought I'd remember which crystals were which once at home, but I not sure anymore...

If you know a little about crystals, I'd be very thankful if you could take a look at some of these pictures (or all :-)) and tell me what you think they are.

Thank you soooo much.

1.

http://i330.photobucket.com/albums/l435/Zertella/DSC02096.jpg

2.

http://i330.photobucket.com/albums/l435/Zertella/DSC02126.jpg

3.

http://i330.photobucket.com/albums/l435/Zertella/DSC02127.jpg

4.

http://i330.photobucket.com/albums/l435/Zertella/DSC02140.jpg

5.

http://i330.photobucket.com/albums/l435/Zertella/DSC02141.jpg

6.

http://i330.photobucket.com/albums/l435/Zertella/DSC02149.jpg

7.

http://i330.photobucket.com/albums/l435/Zertella/DSC02159.jpg

8.

http://i330.photobucket.com/albums/l435/Zertella/DSC02162.jpg

9.

http://i330.photobucket.com/albums/l435/Zertella/DSC02165.jpg

10.

http://i330.photobucket.com/albums/l435/Zertella/DSC02166.jpg

Answer 1

1) is a rock not a crystal

2) is a rock not a crystal

3) this is coal is a mineral

4) talcum is a mineral

5) Quartz

6) not a crystal

7) may be a hematite

8) obsidian

9) a carnelian

10) is not a crystal

11) may be a black cats eye

12) aquamarine

13) also a aquamarine

14) hematite

15) is not a crystal

16) moss Agata

17)amethyst

18) may be a ruby or garnet

12) I may not be right about all of them, I hope I helped a little.

Answer 2

This was the most fun I've had on Y/A in months.  I used to be pretty good at field identification of minerals and rocks (years ago), but most of the ones you show are in disguise.  By that I mean that they are no longer in their "rough" form, but have been tumbled - either by nature (river sediment, sea shore, etc.) or much more likely by man (so called tumble polishing being very common among rock-hounds).  I only agree with a couple of the identifications given by your other answerer, and I am not sure of all of my answers either because for field identification there are more tests used than mere vision (hardness, scratch, streak, cleavage, even smell and taste!) and you have provided only one view of each sample making identification that much more difficult.  All that being said, here is my guesses based on these very limited photos:

I, 2 & 6 are all Agates (a monocrystalline form of quartz which comes in a galaxy of colors and goes by many specialty names like bloodstone, moonstone, rose, etc.)

3 & 8 look more like Tektites (micro meteroids) or volcanic splatter glass than coal (but the best test is hardness - coal is very soft [and it burns!]) - the pits on the surface are a prime indicator for tektites.

5.  this photo does not show enough of the material for any real identification to be made, it looks like a Quartz Taco!  which may mean it is a geode (not all geodes are round) but it is too small to see the form of the crystals for a positive ID

4.  looks like tumbled Quartz/Tourmaline (these minerals commonly occur together and tumbling makes them both harder to identify because you can't see the tell-tale crystalline forms)

7. Horneblend (an igneous rock)

9.  almost certainly Honey Onyx (I've seen enough cheap Mexican chess sets to be able to ID this one in my sleep)

10.  this is tough, may be Jade or Jadeite

11.  Black cat's eye

12, 15 & 16 Sodalite or Lapis Lazuli - both members of the same family of rock (it's the opaque blue color that is tell-tale of this family)

13. Yes, this could be Aquamarine, but given the size and clarity of this sample it is far more likely that it is simply man-made blue-green glass that has been tumbled.

14.  May be Hematite, but I'm really guessing on this one

17. Amethyst

18. Coprolite (look it up on Google - you'll be shocked)