Hypersthene Mineral Data

Hypersthene Mineral Data

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General Hypersthene Information

Chemical Formula:

(Mg,Fe++)2Si2O6

Composition:

Molecular Weight = 232.32 gm

Magnesium 10.46 % Mg 17.35 % MgO

Iron 24.04 % Fe 30.93 % FeO

Silicon 24.18 % Si 51.73 % SiO₂

Oxygen 41.32 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

MgFe²⁺Si₂O₆

Environment:

Minerals of basic igneous rocks and meteorites. Intermediate in composition between enstatite and ferrosilite

IMA Status:

Discredited IMA 1988

Locality:

Dark plutonic rocks of the Adirondack Mountain region of New York, especially the North Creek garnet occurrences. Link to MinDat.org Location Data.

Name Origin:

From in the Greek hyper - "above" and stenos - "power."

Synonym:

Bronzite

Hypersthene Image

Images:

Hypersthene Almandine

Comments: Dark green blocky crystals hypersthene with reddish almandine.
Location: Barton Garnet Mine, North Creek, Warren County, Adirondacks, New York, USA. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Hypersthene Crystallography

Axial Ratios:

a:b:c =2.0611:1:0.5889

Cell Dimensions:

a = 18.2, b = 8.83, c = 5.2, Z = 8; V = 835.67 Den(Calc)= 3.69

Crystal System:

Orthorhombic - DipyramidalH-M Symbol (2/m 2/m 2/m)

Crystal Structure:

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Domeneghetti M C , Molin G M , Stimpfl M , Tribaudino M , American Mineralogist , 80 (1995) p.923-929, Orthopyroxene from the Serra de Mage meteorite: Structure refinement and, estimation of C2/c pyroxene contributions to apparent Pbca diffraction, violations, Sample: OPX SDM N.13, natural

View Additional jPOWD Structure files for Hypersthene
[1]

Physical Properties of Hypersthene

Cleavage:

[100] Perfect, [010] Perfect

Color:

Grayish white, Greenish white, Yellowish white, Bronzy brown, Grayish black.

Density:

3.2 - 3.9, Average = 3.55

Diaphaniety:

Translucent to transparent

Fracture:

Uneven - Flat surfaces (not cleavage) fractured in an uneven pattern.

Habit:

Crystalline - Coarse - Occurs as well-formed coarse sized crystals.

Habit:

Massive - Granular - Common texture observed in granite and other igneous rock.

Hardness:

5.5-6 - Knife Blade-Orthoclase

Luminescence:

None.

Luster:

Vitreous - Silky

Streak:

grayish greenish white

Optical Properties of Hypersthene

Gladstone-Dale:

CI meas= -0.011 (Superior) - where the CI = (1-KPDmeas/KC)
CI calc= 0.028 (Excellent) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1949,KPDmeas= 0.2025,KC= 0.2004

Optical Data:

Biaxial (-), a=1.669-1.755, b=1.674-1.763, g=1.68-1.773, bire=0.0110-0.0180, 2V(Calc)=86, 2V(Meas)=70-90. Dispersion weak, r < v.

Pleochroism (x):

pink, brownish pink, pale yellow, pale red, or colorless.

Pleochroism (y):

pinkish yellow, greenish yellow, yellow, light green, or colorless.

Pleochroism (z):

light green, bluish green, grayish green, blue, or colorless.

Calculated Properties of Hypersthene

Electron Density:

r_electron=3.48 gm/cc
note: r_Hypersthene=3.55 gm/cc.

Fermion Index

Fermion Index = 0.02704
Boson Index = 0.97296

Photoelectric:

PE_Hypersthene= 8.29 barns/electron
U=PE_Hypersthene x r_electron= 28.88 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Hypersthene is Not Radioactive

Hypersthene Classification

Dana Class:

65.0.0.0 (65)Inosilicate Minerals

(65.0)Without Dana Classification Numbers

(Pyroxenes, Ortho)

Strunz Class:

VIII/F.02-00 VIII - Silicates

VIII/F - Inosilicates (chain and band) double chains [Si2O6]4-

VIII/F.02 - Pyroxene group, Orthopyroxene

Other Hypersthene Information

References:

NAME( Pough60) PHYS. PROP.(Pough60) OPTIC PROP.(Heinrich65)

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Hypersthene

(Mg,Fe++)2Si2O6
Dana No: Unknown Strunz No: VIII/F.02-00
Locality:

Notes: