Grape Willemite

Physical

Transparency: Transparent · Translucent
Colour: Burgundy-red
Streak: White

Optical

UV response: Green (SW UV).

Chemical composition

Constituent elements: Mass composition breakdown
Element Atoms At. mass g/mol Mass g/mol Mass share
30ZnZinc Zinc 2 65.380 130.760
58.68%
8OOxygen Oxygen 4 15.999 63.996
28.72%
14SiSilicon Silicon 1 28.085 28.085
12.60%
Total 222.841 100.00%
Mass share = atoms × atomic mass ÷ molar mass × 100
From Mindat formula

Mass composition breakdown
Element	Atoms	At. mass g/mol	Mass g/mol	Mass share
30ZnZinc	Zinc	2	65.380	130.760	58.68%
8OOxygen	Oxygen	4	15.999	63.996	28.72%
14SiSilicon	Silicon	1	28.085	28.085	12.60%
	Total	222.841	100.00%

Literature, links & citation

Cite this entry

@misc{mineral2026,
  author    = {Mineral Index editorial board},
  title     = {Grape Willemite — Mineral Index},
  year      = {2026},
  url       = {https://mineralindex.org/minerals/grape-willemite-11410},
  note      = {Accessed 2026-05-11}
}