putnisite

Etymology
, from the name of the discoverers, mineralogists Andrew and Christine Putnis.

Noun

 * 1) A quartz-like mineral, purple in colour, naturally occurring brittle crystals smaller than 0.5 mm, with an orthorhombic crystalline matrix of SrCa4Cr3+8(CO3)8SO4(OH)16&middot;23H2O