Montroydite Mineral Data

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General Montroydite Information

Chemical Formula:

HgO

Composition:

Molecular Weight = 216.59 gm

Mercury 92.61 % Hg 100.00 % HgO

Oxygen 7.39 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

HgO

Environment:

Oxidized mercury deposits.

IMA Status:

Valid Species (Pre-IMA) 1903

Locality:

Terlingua, Texas, USA. Link to MinDat.org Location Data.

Name Origin:

Named for Montroyd Sharp, an owner of the mercury deposit at Terlingua, Texas, USA.

Name Pronunciation:

Montroydite + Pronunciation

Synonym:

ICSD 15890

PDF 34-1469

Montroydite Image

Images:

Montroydite

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

Images:

Montroydite Pinchite

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

Axial Ratios:

a:b:c =1.8824:1:1.5667

Cell Dimensions:

a = 6.613, b = 3.513, c = 5.504, Z = 4; V = 127.87 Den(Calc)= 11.25

Crystal System:

Orthorhombic - DipyramidalH-M Symbol (2/m 2/m 2/m) Space Group: P nma

$Help on X Ray Diffraction:$ X Ray Diffraction:

By Intensity(I/I_o): 2.967(1), 2.834(0.8), 2.408(0.65),

Forms:

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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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Crystal Structure:

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Aurivillius K , Acta Chemica Scandinavica , 18 (1964) p.1305-1306, Least-squares refinement of the crystal structures of orthorhombic HgO and of, Hg2O2NaI, Locality: synthetic

Physical Properties of Montroydite

Cleavage:

{010} Perfect

Color:

Red, Brownish red, Brown.

Density:

11.2

Diaphaneity:

Transparent to Translucent

Fracture:

Sectile - Curved shavings or scrapings produced by a knife blade, (e.g. graphite).

Habit:

Crystalline - Fine - Occurs as well-formed fine sized crystals.

Hardness:

1.5-2 - Talc-Gypsum

Luminescence:

Non-fluorescent.

Luster:

Adamantine

Magnetism:

Nonmagnetic

Streak:

reddish orange

Optical Properties of Montroydite

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

Optical Data:

Biaxial (+), a=2.37, b=2.5, g=2.65, bire=0.2800

Calculated Properties of Montroydite

Electron Density:

Bulk Density (Electron Density)=9.14 gm/cc
note: Specific Gravity of Montroydite =11.3 gm/cc.

Fermion Index:

Fermion Index = 0.27
Boson Index = 0.73

Photoelectric:

PE_Montroydite=1,613.18 barns/electron
U=PE_Montroydite x rElectron Density=14747.22 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Montroydite is Not Radioactive

Montroydite Classification

Dana Class:

04.02.06.01 (04)Simple Oxides

(04.02)with a cation charge of 2+ (A++ O)

(04.02.06)Dana Group

04.02.06.01 Montroydite HgO P nma 2/m 2/m 2/m

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

References:

NAME( AntBidBlaNic3) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Ford32)

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
16 - WWW-MINCRYST

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Ask about Montroydite here :
Ask-A-Mineralogist from the Mineralogical Society of America
Mindat.org's Discussion Groups
Original Rockhounds Discussion Group
Rockhounds Discussion Group on Yahoo Groups
Mineral Discussion Forum from Fabre Minerals - also available in Español

Print or Cut-and-Paste your Montroydite Specimen Label here :

Montroydite

HgO
Dana No: 04.02.06.01 Strunz No: 04.AC.15
Locality:

Notes: