Montroydite | |
---|---|
General | |
Category | Oxide mineral |
Formula (repeating unit) | HgO |
IMA symbol | Mtyd[1] |
Strunz classification | 4.AC.15 |
Crystal system | Orthorhombic |
Crystal class | Dipyramidal (mmm) H-M Symbol: (2/m 2/m 2/m) |
Unit cell | a = 5.52 Å, b = 6.6 Å, c = 3.52 Å; Z=4 |
Identification | |
Color | Deep red, brownish red to brown |
Crystal habit | Long prismatic, equant, rarely flattened; striated; massive to vermicular clusters |
Cleavage | Perfect {010} |
Tenacity | Sectile |
Mohs scale hardness | 1.5 - 2.0 |
Luster | Sub-adamantine, vitreous |
Streak | Yellow brown |
Diaphaneity | Transparent to translucent |
Specific gravity | 11.23 |
Optical properties | Biaxial (+) |
Refractive index | nα = 2.370 nβ = 2.500 nγ = 2.650 |
Birefringence | δ = 0.280 |
Pleochroism | Deep red-orange to yellowish brown (visible in thick sections) |
2V angle | Large |
References | [2][3] |
Montroydite is the mineral form of mercury(II) oxide with formula HgO. It is a rare mercury mineral. It was first described for an occurrence in the mercury deposit at Terlingua, Texas and named for Montroyd Sharp who was an owner of the deposit.[2]
Montroydite occurs in mercury deposits of hydrothermal origin. Associated minerals include: native mercury, cinnabar, metacinnabar, calomel, eglestonite, terlinguaite, mosesite, kleinite, edgarbaileyite, gypsum, calcite and dolomite.[3]
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.
- 1 2 Mindat.org
- 1 2 "Handbook of Mineralogy" (PDF). Archived from the original (PDF) on 2022-07-02. Retrieved 2017-08-04.
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