IronManoc

Hi Geologyhound, Thank you for the info. I have also checked online and it has similar patterns to Carborundum. I have attached two images of the patterns. Please note that the tiny whitish grains are sand so they are not attached to the actual rock. Thank you again for the reply.

Hi Steve, Thank you for the info. What surprised me was that it is not detectable by a metal detector however with a diamond tester it 'rings'. It is also extremely tough and with the streak test it does not mark anything. Thank you again for the links.

Hi All, Can someone provide me with some information about the rock/crystal in the image attached? This rock/crystal is not attracted to magnets and is not detectable with a metal detector. The approximate dimensions are as follows: length 9.5cm, breadth 6.5cm and height 7.5cm. It weighs about 490g which is pretty heavy for its size. The main color is dark silver color and reflects green, blue and purple.