Mineral Factbook

Montroydite

HgOIMA symbol: Mtydgrandfathered

Montroydite is an oxide or hydroxide mineral with the formula HgO. It has a Mohs hardness of 1.5-2, typically orange or red in color, with an adamantine or vitreous luster, a calculated density of 11.189 g/cm3. Its streak is orange or red.

Photos

Montroydite specimen photo
Kritzolina · CC BY-SA 4.0 · Commons
Montroydite specimen photo
Marko Burkhardt · CC BY-SA 3.0 de · Commons
Montroydite specimen photo
Kritzolina · CC BY-SA 4.0 · Commons
Montroydite specimen photo
Kritzolina · CC BY-SA 4.0 · Commons

Crystallography

Space groupP n m a
Cell (Å, °)a = 6.6129, b = 5.5208, c = 3.5219; α = 90, β = 90, γ = 90
Cell volume128.579 ų, Z = 4
Axial ratios1.1978:1:0.6379calculated from COD 9012530
Source structureCOD 9012530 (Acta Chemica Scandinavica, 1964)

Powder X-ray diffraction (calculated)

2θ (degrees, Cu Kα1)I/I₀ (max 100)
d (Å)2.9692.8372.4111.8162.761.496
I/I₀10080.667.85853.930

xrd-v1: CuKa1 1.5406A, 2theta 5-90, top10, Imax=100, no DW/PO. Computed from COD 9012530; idealized occupancies, no preferred orientation.

Physical properties

Density (calculated)11.189 g/cm³calculated from COD 9012530
Hardness (Mohs)
1.5-2Dana's System, 2nd Appendix (1909)
Color
orange, redDana's System, 2nd Appendix (1909)
Streak
orange, redDana's System, 2nd Appendix (1909)
Luster
adamantine, vitreousDana's System, 2nd Appendix (1909)

Chemistry (calculated)

Molecular weight216.59 g/molcalculated from the IMA formula
Composition (wt%)Hg 92.61%, O 7.39%

Classification

Nickel-Strunz (10th)4.AC.15Wikidata (CC0)
Nickel-Strunz (9th)4.AC.15Wikidata (CC0)
Dana (8th)4.2.6.1Wikidata (CC0)