Chlorastrolite

Where it forms, where it's found

19recorded occurrences

Source · OpenStreetMap

Chemical composition

Constituent elements: Mass composition breakdown
Element Atoms At. mass g/mol Mass g/mol Mass share
8OOxygen Oxygen 14 15.999 223.986
47.59%
14SiSilicon Silicon 3 28.085 84.255
17.90%
20CaCalcium Calcium 2 40.078 80.156
17.03%
13AlAluminium Aluminium 2 26.982 53.964
11.46%
12MgMagnesium Magnesium 1 24.305 24.305
5.16%
1HHydrogen Hydrogen 4 1.008 4.032
0.86%
Total 470.698 100.00%
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
8OOxygen	Oxygen	14	15.999	223.986	47.59%
14SiSilicon	Silicon	3	28.085	84.255	17.90%
20CaCalcium	Calcium	2	40.078	80.156	17.03%
13AlAluminium	Aluminium	2	26.982	53.964	11.46%
12MgMagnesium	Magnesium	1	24.305	24.305	5.16%
1HHydrogen	Hydrogen	4	1.008	4.032	0.86%
	Total	470.698	100.00%

Synonyms

Chlorastrolit
Clorastrolita
Green Starstone
Turtle Back

Literature, links & citation

Citations

—https://www.mindat.org/a/chlorastrolite
1975Huber, Norman King (1975) The Geologic Story of Isle Royale National Park. Bulletin 1309 (1st ed.). US Geological Survey 66 pp. doi:10.3133/b1309 DOI: 10.3133/b1309
1975Norman King Huber(1975)

Cite this entry

@misc{mineral2026,
  author    = {Mineral Index editorial board},
  title     = {Chlorastrolite — Mineral Index},
  year      = {2026},
  url       = {https://mineralindex.org/minerals/chlorastrolite-11469},
  note      = {Accessed 2026-05-11}
}