I magnify the 3 color inside the stone.
Ahmed, can you please post a few more pictures? Perhaps that will give a better indication of the crystal structure...
Looks mostly like quartz, but there are some interesting crystal faces. Can you give any more information such as locality and hardness?
1_It scratch knife (harder than knife).
2-And it is from saudia arabia.
3-Wight is 1.4kg.
4-Crystal is very clear.
5-It give sometimes tanzanite and some other time give topaz on presidium thermometer.
6- clearly you can see three colores blue and yelow and violate inside the crystal.
Thanks. I still think its most likely quartz. There are often iridescent colors inside a flaw plane within a crystal so the three colors inside the crystal are probably from that. Do you have any pieces of quartz to use to do another scratch test?
Hershel; what is the brown outer layer on the crystal? Iron ore?
Yes, most likely iron ore, such as limonite staining. Usually easy to remove with super iron out...