Black Tourmaline Crystal Pyramid Pyrite This Q2 formation geode from

This Q2 formation geode from Uruguay combines a tall profile with an open crystal face and textured natural edges

Softer than quartz at Mohs 6–6

The colour is the reason to want it - pale aqua to deep teal

Its structure invites stillness and perspective

Black Tourmaline Crystal Pyramid Pyrite This Q2 formation geode fromBlack tourmaline a dense, true black cut to four faces and an apex, marked with fine lengthwise grooves: schorl, one of the most chemically complex minerals cut as a stone. From Brazil, a pyramid. It is schorl, a sodium iron rich tourmaline, one of the most complex borosilicate minerals known, its formula running to a dozen elements; iron gives the deep black. Harder than quartz at Mohs 77. 5, with fine striations that often survive the polish.