I think it might be aventurine of some sort, but I'm not sure.
- Hardness: It is harder than a steel nail file. The file leaves a track, but it rubs off, leaving no mark. I scraped it on the bottom unglazed portion of a mug. It left no marks on the mug and white power on the stone that mostly rubbed off.
- Lustre: It has a waxy or greasy lustre.
- It has bluish 'veins' below the surface, one dark green spot, and one light blue spot.
What other tests can I make?