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Montroydite

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Formula:
HgO
Colour:
Deep red, brownish red to brown; Orange-red to pale yellow in transmitted light, with decreasing thickness
Lustre:
Sub-Adamantine, Vitreous
Hardness:
1½ - 2
Specific Gravity:
11.23
Crystal System:
Orthorhombic
Name:
After Montroyd Sharp (1861 England - ), an owner of the Terlingua, Texas, USA, mine where it was found. (He resided in Santa Cruz California in the 1930's and donated his mineral collection to museum in city)
This page provides mineralogical data about Montroydite.


Classification of Montroydite

Approved, 'Grandfathered' (first described prior to 1959)
4.AC.15

4 : OXIDES (Hydroxides, V[5,6] vanadates, arsenites, antimonites, bismuthites, sulfites, selenites, tellurites, iodates)
A : Metal: Oxygen = 2:1 and 1:1
C : M:O = 1:1 (and up to 1:1.25); with large cations (+- smaller ones)
4.2.6.1

4 : SIMPLE OXIDES
2 : AX
7.5.12

7 : Oxides and Hydroxides
5 : Oxides of Zn, Cd and Hg

Physical Properties of Montroydite

Sub-Adamantine, Vitreous
Transparency:
Transparent, Translucent
Colour:
Deep red, brownish red to brown; Orange-red to pale yellow in transmitted light, with decreasing thickness
Streak:
Yellow-brown
Hardness:
1½ - 2 on Mohs scale
Tenacity:
Sectile
Cleavage:
Perfect
Perfect {010}.
Density:
11.23 g/cm3 (Measured)    11.22 g/cm3 (Calculated)

Optical Data of Montroydite

Type:
Biaxial (+)
RI values:
nα = 2.370 nβ = 2.500 nγ = 2.650
Max Birefringence:
δ = 0.280
Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.
Surface Relief:
Very High
Dispersion:
relatively strong

Chemical Properties of Montroydite

Formula:
HgO

Crystallography of Montroydite

Crystal System:
Orthorhombic
Class (H-M):
mmm (2/m 2/m 2/m) - Dipyramidal
Space Group:
Pmmn
Cell Parameters:
a = 5.52 Å, b = 6.6 Å, c = 3.52 Å
Ratio:
a:b:c = 0.836 : 1 : 0.533
Unit Cell V:
128.24 ų (Calculated from Unit Cell)
Morphology:
Long prismatic[001]; also equant or rarely flattened {111}. Terminal faces often striated; on {011} parallel [100], on {201} parallel [101], the pyramids often with several sets of striae. As wormlike, tubular, or spherical aggregates consisting usually of minute prismatic crystals. Massive, pulverulent, or banded. Crystals often bent or twisted.
Twinning:
Crystals glide readily: bent-gliding and twist-gliding with T{010} and t[001]; also other, unidentified gliding elements.

Crystallographic forms of Montroydite

Crystal Atlas:
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Montroydite no.1 - Goldschmidt (1913-1926)
Montroydite no.14 - Goldschmidt (1913-1926)
3d models and HTML5 code kindly provided by www.smorf.nl.

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Type Occurrence of Montroydite

Other Language Names for Montroydite

Common Associates

Associated Minerals Based on Photo Data:
Mercury9 photos of Montroydite associated with Mercury on mindat.org.
Cinnabar9 photos of Montroydite associated with Cinnabar on mindat.org.
Edgarbaileyite5 photos of Montroydite associated with Edgarbaileyite on mindat.org.
Terlinguaite4 photos of Montroydite associated with Terlinguaite on mindat.org.
Quartz3 photos of Montroydite associated with Quartz on mindat.org.
Kleinite3 photos of Montroydite associated with Kleinite on mindat.org.
Calcite2 photos of Montroydite associated with Calcite on mindat.org.
Eglestonite1 photo of Montroydite associated with Eglestonite on mindat.org.

Related Minerals - Nickel-Strunz Grouping

4.AC.05SwedenborgiteNaBe4Sb5+O7
4.AC.10BrownmilleriteCa2(Al,Fe3+)2O5
4.AC.10SrebrodolskiteCa2Fe3+2O5
4.AC.20LithargePbO
4.AC.20RomarchiteSnO
4.AC.25MassicotPbO

Related Minerals - Hey's Chemical Index of Minerals Grouping

7.5.1ZinciteZnO
7.5.2SweetiteZn(OH)2
7.5.3AshoveriteZn(OH)2
7.5.4WülfingiteZn(OH)2
7.5.5GahniteZnAl2O4
7.5.6HetaeroliteZnMn2O4
7.5.7HydrohetaeroliteZnMn2O4 · H2O
7.5.8Chalcophanite(Zn,Fe,Mn)Mn3O7 · 3H2O
7.5.9WoodruffiteZn2+x/2(Mn4+1-xMn3+x)O2·yH2O
7.5.10FrankliniteZn2+Fe3+2O4
7.5.11MonteponiteCdO

Other Information

Health Risks:
Contains mercury - always wash hands after handling. Avoid inhaling dust when handling or breaking. Never lick or ingest.

References for Montroydite

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Moses (1903), American Journal of Science: 16: 259.
Hllebrand and Schaller (1909), USGS Bulletin 405: 47.
Bird (1932), American Mineralogist: 17: 541.
Acta Chemica Scandinavica: 10: 852-866.
Palache, Charles, Harry Berman & Clifford Frondel (1944), The System of Mineralogy of James Dwight Dana and Edward Salisbury Dana Yale University 1837-1892, Volume I: Elements, Sulfides, Sulfosalts, Oxides. John Wiley and Sons, Inc., New York. 7th edition, revised and enlarged: 511-514.
Acta Crystallographica (1956): 685.

Internet Links for Montroydite

mindat.org URL:
https://www.mindat.org/min-2771.html
Please feel free to link to this page.
Specimens:
The following Montroydite specimens are currently listed for sale on minfind.com.

Localities for Montroydite

This map shows a selection of localities that have latitude and longitude coordinates recorded. Click on the symbol to view information about a locality. The symbol next to localities in the list can be used to jump to that position on the map.
(TL) indicates type locality for a valid mineral species. (FRL) indicates first recorded locality for everything else. ? indicates mineral may be doubtful at this locality. All other localities listed without reference should be considered as uncertain and unproven until references can be found.
Belgium
 
  • Luxembourg Province
    • Stavelot Massif
      • Vielsalm
http://perso.infonie.be/jose.dehove/photos/Salmchateau.htm
China
 
  • Guangxi Zhuang Autonomous Region
    • Guilin Prefecture
      • Lingui Co.
Deqian Wang and Yiting Hou (1987): Journal of Mineralogy and Petrology 8(4), 38-42
  • Sichuan Province
    • Garzê Autonomous Prefecture (Ganzi Autonomous Prefecture)
      • Baiyu Co.
Xiaoming Qu, Qiling Zhang, Zengqian Hou, Yuanping Xu, and Jinzhong Li (2001): Mineral Deposits 20(3), 199-207
Italy
 
  • Tuscany
    • Grosseto Province
      • Amiata Mt.
        • Castell'Azzara
Manfred Kampf collection
    • Siena Province
      • Amiata Mt.
        • Piancastagnaio
Kyrgyzstan
 
  • Osh Oblast
    • Alai Range (Alay Range)
[Lapis 1993:11 p11-24]
      • Fergana Valley
[Lapis 11:11-24]; Pekov, I. (1998) Minerals First discovered on the territory of the former Soviet Union 369p. Ocean Pictures, Moscow; Vasil'yev, V. I., Lavrent'yev, Y. G., & Pal'chik, N. A. (1982). Poyarkovite, Hg3CIO, a new natural mercury oxychloride. International Geology Review, 24(3), 363-366.
Mexico
 
  • Guerrero
    • Mun. de Taxco
      • Hauhauxtla
Panczner (1987): 135-372.
  • Queretaro
    • Mun. de Cadereyta
      • El Doctor (Doctor)
Panczner (1987): 279.
Russia
 
  • Eastern-Siberian Region
    • Tuva Republic
      • Pii-Khem District
        • Uyuk Range
Canadian Mineralogist Feb. 1999; Pervukhina, N. V., Vasil’ev, V. I., Borisov, S. V., Magarill, S. A., & Naumov, D. Y. (2003). The crystal structure of a polymorph of Hg2+ 3S2Br1. 0Cl0. 5I0. 5. The Canadian Mineralogist, 41(6), 1445-1453.
          • Oorash-Khem River Valley
Pervukhina, N. V., Vasil’ev, V. I., Borisov, S. V., Magarill, S. A., & Naumov, D. Y. (2003). The crystal structure of a polymorph of Hg2+ 3S2Br1. 0Cl0. 5I0. 5. The Canadian Mineralogist, 41(6), 1445-1453.
USA
 
  • Arkansas
    • Pike Co.
Roberts, A.C. et al (2003), The Canadian Mineralogist: 41(3): 721-725.
  • California
    • Kings Co.
      • Diablo Range
        • Parkfield District
          • Table Mountain
Pemberton, H. Earl (1983), Minerals of California; Van Nostrand Reinholt Press: 181.
    • Lake Co.
      • Knoxville District
        • Knoxville area
Bradley, W.W. (1938), Thirty-fourth report of the State Mineralogist: California Division Mines Report 34: 608; Murdoch, Joseph & Robert W. Webb (1966), Minerals of California, Centennial Volume (1866-1966): California Division Mines & Geology Bulletin 189: 273; Pemberton, H. Earl (1983), Minerals of California; Van Nostrand Reinholt Press: 181.
    • Monterey Co.
      • Diablo Range
        • Parkfield District
          • Parkfield
            • Table Mountain
Pemberton, H. Earl (1983), Minerals of California; Van Nostrand Reinholt Press: 181.
    • Napa Co.
      • Knoxville District
        • Knoxville
Kim, C. S., Rytuba, J. J., & Brown Jr, G. E. (2004). Geological and anthropogenic factors influencing mercury speciation in mine wastes: an EXAFS spectroscopy study. Applied Geochemistry, 19(3), 379-393.
    • San Benito Co.
      • Diablo Range
        • New Idria District
          • Picacho Peak
Murdoch, Joseph & Robert W. Webb (1966), Minerals of California, Centennial Volume (1866-1966): California Division Mines & Geology Bulletin 189: 273.
Canadian Mineralogist: 34: 61-72.; Mineralogical Record (1993): 24: 471-475.
    • San Mateo Co.
      • Emerald Lake Hills
Woodhouse, C.D. (1934), A new occurrence of montroydite in California: American Mineralogist: 19: 603-604; Pemberton, H. Earl (1983), Minerals of California; Van Nostrand Reinholt Press: 181.
      • Redwood City
Mining and Scientific Press (1868), Quicksilver in San Mateo County (from San Mateo Gazette): Mining and Scientific Press: 16: 357; Woodhouse, C.D. (1934), A new occurrence of montroydite in California: American Mineralogist: 19: 603; Murdoch, Joseph & Robert W. Webb (1966), Minerals of California, Centennial Volume (1866-1966): California Division Mines & Geology Bulletin 189: 260.
Woodhouse, C.D. (1934), A new occurrence of montroydite in California: American Mineralogist: 19: 603-604; Murdoch, Joseph & Robert W. Webb (1966), Minerals of California, Centennial Volume (1866-1966): California Division Mines & Geology Bulletin 189: 119, 174, 273.
    • Sonoma Co.
      • Mayacmas Mts (Mayacamas Mts)
        • West Mayacmas District
          • Black Oaks
            • Sulphur Creek
Bradley, W.W. (1938), Thirty-fourth report of the State Mineralogist: California Division Mines Report 34: 608; Murdoch, Joseph & Robert W. Webb (1966), Minerals of California, Centennial Volume (1866-1966): California Division Mines & Geology Bulletin 189: 274; Pemberton, H. Earl (1983), Minerals of California; Van Nostrand Reinholt Press: 181.
          • Castle Rock Springs area
Bailey, Edgar H. (1946), Quicksilver deposits of the western Mayacmas district, Sonoma County, California: California Journal of Mines & Geology, California Division Mines (Report 42): 42: 216; Pemberton, H. Earl (1983), Minerals of California; Van Nostrand Reinholt Press: 181; Mineralogical Record (1989) 20: 129-142.
  • Nevada
    • Humboldt Co.
      • Opalite District
NBMG Spec. Pub. 31 Minerals of Nevada
      • Poverty Peak District
NBMG Spec. Pub. 31 Minerals of Nevada
    • Mineral Co.
      • Borealis District
        • Borealis mine
NBMG Spec. Pub. 31 Minerals of Nevada
    • Nye Co.
      • Bare Mountain
        • Bare Mountain District (Fluorine District)
NBMG Spec. Pub. 31 Minerals of Nevada
      • Paradise Range
        • Paradise Peak District
          • Paradise Peak [summit]
            • Paradise Peak [town]
NBMG Spec. Pub. 31 Minerals of Nevada
Econ Geol (1989) 84:631-649
    • White Pine Co.
      • Robinson District
NBMG Spec. Pub. 31 Minerals of Nevada
  • Texas
    • Brewster Co.
American Journal of Science, series 4 (1903): 16: 253; Palache, C., Berman, H., & Frondel, C. (1951), The System of Mineralogy of James Dwight Dana and Edward Salisbury Dana, Yale University 1837-1892, Volume II: 52, 90.
Rocks & Minerals: 66(1): 202.
Mineral and/or Locality  
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