Montroydite Mineral Data

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.

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

Diaphaniety:

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:

None.

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

Optical Data:

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

Calculated Properties of Montroydite

Electron Density:

r_electron=9.14 gm/cc
note: r_Montroydite=11.3 gm/cc.

Fermion Index

Fermion Index = 0.27972
Boson Index = 0.72028

Photoelectric:

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

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Montroydite is Not Radioactive

Montroydite Classification

Dana Class:

4.2.6.1 (4)Simple Oxides

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

(4.2.6)Dana Group

4.2.6.1 Montroydite HgO P nma 2/m 2/m 2/m

Strunz Class:

IV/A.06-10 IV - Oxides

IV/A - Oxides with metal : oxygen = 1:1 and 2:1 (M2O,MO)

IV/A.06 - Periclase Group, Montroydite - Massicotite series

IV/A.06-10 Montroydite HgO P nma 2/m 2/m 2/m

IV/A.06-20 Litharge PbO P 4/nmm 4/m 2/m 2/m

IV/A.06-30 Massicot PbO Pbma 2/m 2/m 2/m

Other Montroydite Information

References:

NAME( Ford32) 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 -Google Images 5 -Google Scholar 6 -Handbook of Mineralogy (UofA) 7 - HyperPhysics 8 -MinDAT 9 -MinMax(Deutsch) 10 -MinMax(English) 11 -Mineralienatlas (Deutsch) 12 -QUT Mineral Atlas 13 - WWW-MINCRYST 14 -École des Mines de Paris

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Montroydite

HgO
Dana No: 4.2.6.1 Strunz No: IV/A.06-10
Locality:

Notes: