| Hodgkinsonite | |
|---|---|
 Hodgkinsonite from Franklin Mine, Franklin, New Jersey USA. The translucent and lustrous crystals reach 8 mm and the main crystal here is doubly terminated. | |
| General | |
| Category | Nesosilicate |
| Formula (repeating unit) | Zn2MnSiO4(OH)2 |
| IMA symbol | Hgk |
| Strunz classification | 9.AE.20 |
| Crystal system | Monoclinic |
| Crystal class | Prismatic (2/m) (same H-M symbol) |
| Space group | P21/a |
| Unit cell | a = 11.76, b = 5.31 c = 8.18 ; β = 95.42°, Z = 4 |
| Identification | |
| Mohs scale hardness | 4+1⁄2 - 5 |
| Optical properties | Biaxial (-) |
| Refractive index | nα = 1.720 nβ = 1.741 nγ = 1.746 |
| Birefringence | δ = 0.026 |
| Dispersion | r < v moderate |
Hodgkinsonite is a rare zinc manganese silicate mineral Zn2MnSiO4(OH)2. It crystallizes in the monoclinic system and typically forms radiating to acicular prismatic crystals with variable color from pink, yellow-red to deep red. Hodgkinsonite was discovered in 1913 by H. H. Hodgkinson, for whom it is named in Franklin, New Jersey, and it is only found in that area.
References
- Warr, L.N. (2021). "IMA–CNMNC approved mineral symbols". Mineralogical Magazine. 85 (3): 291–320. Bibcode:2021MinM...85..291W. doi:10.1180/mgm.2021.43. S2CID 235729616.
- Mineral Galleries Archived 2008-10-18 at the Wayback Machine. Accessed August 22, 2008.
- http://rruff.geo.arizona.edu/doclib/hom/hodgkinsonite.pdf Manual of Mineralogy
- http://webmineral.com/data/Hodgkinsonite.shtml Webmineral
- http://www.mindat.org/min-1913.html Mindat
External links
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