Offbeat specimen of twinned Tetrahedrite crystals with alteration by green Malachite from El Coriellu mine, Spain. On white Quartz base grow Tetrahedrite crystals to 8mm with sharp shape. At the top they show penetration twinning. The green Malachite covers the crystals. In very good condition - some Quartz contacts. On acrylic base.

Excellent!