▲ 58 r/askgeology
My grandfather gave me 2 like this long ago and said they were crystals from Mexico. He got them when he was in Mexico in his 20s but... they scratch quartz, chert and glass. Now I'm not sure what they are. Any idea ? Because it can't really be diamond each weighting over 4 grams. I'm not that lucky
u/Axthanx — 5 days ago