Mineralogy Database

Montroydite Mineral Data

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General Montroydite Information

Help on Chemical  Formula: Chemical Formula: HgO
Help on Composition: Composition: Molecular Weight = 216.59 gm
   Mercury  92.61 %  Hg  100.00 % HgO
   Oxygen    7.39 %  O
           ______        ______ 
           100.00 %      100.00 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: HgO
Help on Environment: Environment: Oxidized mercury deposits.
Help on IMA Status: IMA Status: Valid Species (Pre-IMA) 1903
Help on Locality: Locality: Terlingua, Texas, USA. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for Montroyd Sharp, an owner of the mercury deposit at Terlingua, Texas, USA.
Help on Name Pronunciation: Name Pronunciation: Montroydite + Pronunciation Say MONTROYDITE
Help on Synonym: Synonym: ICSD 15890
  PDF 34-1469

Montroydite Image

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Comments: Red to orange radial and crystalline montroydite aggregates on black calcite.
Location: Terlingua, Brewster County, Texas, USA. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

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  Pinchite   Montroydite

Comments: Minute lustrous black pinchite crystals on white montroydite.
Location: Terlingua, Brewster County, Texas, USA. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Montroydite Crystallography

Help on Axial Ratios: Axial Ratios: a:b:c =1.8824:1:1.5667
Help on Cell Dimensions: Cell Dimensions: a = 6.613, b = 3.513, c = 5.504, Z = 4; V = 127.87 Den(Calc)= 11.25
Help on Crystal System: Crystal System: Orthorhombic - Dipyramidal H-M Symbol (2/m 2/m 2/m) Space Group: P nma
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 2.967(1), 2.834(0.8), 2.408(0.65),
Help on Forms: Forms:

Dbl Clk - Start-Stop Rotation
RMB - Cycle Display Modes
Drag1 - Manipulate Crystal
Drag2 - Resize

S - Stereo
I - Indicies
<space> - Start-Stop Rotation
F - Fit to Screen
M - Menu

Help on Above

Forms: ( 3 0 1) ( 0 1 0) ( 1 1 1) ( 2 2 1) ( 0 1 1) ( 6 0 1) ( 3 1 2) ( 1 0 0) ( 2 6 3) ( 1 1 0)

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Physical Properties of Montroydite

Help on Cleavage: Cleavage: {010} Perfect
Help on Color: Color: Red, Brownish red, Brown.
Help on Density: Density: 11.2
Help on Diaphaneity: Diaphaneity: Transparent to Translucent
Help on Fracture: Fracture: Sectile - Curved shavings or scrapings produced by a knife blade, (e.g. graphite).
Help on Habit: Habit: Crystalline - Fine - Occurs as well-formed fine sized crystals.
Help on Hardness: Hardness: 1.5-2 - Talc-Gypsum
Help on Luminescence: Luminescence: Non-fluorescent.
Help on Luster: Luster: Adamantine
Help on Magnetism: Magnetism: Nonmagnetic
Help on Streak: Streak: reddish orange

Optical Properties of Montroydite

Help on Gladstone-Dale: Gladstone-Dale: CI meas= -0.094 (Poor) - where the CI = (1-KPDmeas/KC)
CI calc= -0.089 (Poor) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1339,KPDmeas= 0.1345,KC= 0.123
Ncalc = 2.38
Help on Optical Data: Optical Data: Biaxial (+), a=2.37, b=2.5, g=2.65, bire=0.2800

Calculated Properties of Montroydite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=9.14 gm/cc
note: Specific Gravity of Montroydite =11.3 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.27
Boson Index = 0.73
Help on Photoelectric: Photoelectric: PEMontroydite =1,613.18 barns/electron
U=PEMontroydite x rElectron Density=14747.22 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Montroydite is Not Radioactive

Montroydite Classification

Help on  Dana Class: Dana Class: (04)Simple Oxides
  (04.02)with a cation charge of 2+ (A++ O)
  (04.02.06)Dana Group Montroydite HgO P nma 2/m 2/m 2/m
Help on  Strunz Class: Strunz Class: 04.AC.15 04 - OXIDES (Hydroxides, V[5,6] vanadates, arsenites, antimonites, bismuthites, sulfites, selenites, tellurites, iodate
  04.A - Metal:Oxygen = 2.1 and 1:1
  04.AC -M:O = 1:1 (and up to 1:1.25); with large cations (� smaller ones)
04.AC.15 Montroydite HgO P nma 2/m 2/m 2/m

Other Montroydite Information

Help on References: References: NAME( AntBidBlaNic3) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Ford32)
Help on See Also: See Also: Links to other databases for Montroydite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - EUROmin Project
4 - Ecole des Mines de Paris
5 - GeoScienceWorld
6 - Google Images
7 - Google Scholar
8 - Handbook of Mineralogy (MinSocAm)
9 - Handbook of Mineralogy (UofA)
10 - HyperPhysics
11 - MinDAT
12 - Mineralienatlas (Deutsch)
13 - Online Mineral Museum
14 - QUT Mineral Atlas
15 - Ruff.Info

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Dana No: Strunz No: 04.AC.15





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