Clinothulite

Where it forms, where it's found

Geological setting: Frequently found in granite pegmatite, such as in Mitchell and Yancey Counties, North Carolina (Richard C. Erd, U. S. Geological Survey, 1996, unpublished data).

13recorded occurrences

Source · OpenStreetMap

Physical

Colour: Pink

Chemical composition

Constituent elements: Mass composition breakdown
Element Atoms At. mass g/mol Mass g/mol Mass share
8OOxygen Oxygen 13 15.999 207.987
45.78%
14SiSilicon Silicon 3 28.085 84.255
18.54%
13AlAluminium Aluminium 3 26.982 80.946
17.82%
20CaCalcium Calcium 2 40.078 80.156
17.64%
1HHydrogen Hydrogen 1 1.008 1.008
0.22%
Total 454.352 100.00%
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	13	15.999	207.987	45.78%
14SiSilicon	Silicon	3	28.085	84.255	18.54%
13AlAluminium	Aluminium	3	26.982	80.946	17.82%
20CaCalcium	Calcium	2	40.078	80.156	17.64%
1HHydrogen	Hydrogen	1	1.008	1.008	0.22%
	Total	454.352	100.00%

Synonyms

Klinothulit

Literature, links & citation

Citations

—Rocks & Minerals, July 2001.

Cite this entry

@misc{mineral2026,
  author    = {Mineral Index editorial board},
  title     = {Clinothulite — Mineral Index},
  year      = {2026},
  url       = {https://mineralindex.org/minerals/clinothulite-27132},
  note      = {Accessed 2026-05-11}
}