Hydroxylclinohumite Mineral Data

General Hydroxylclinohumite Information

Chemical Formula:

Mg9(SiO4)4(OH,F)2

Composition:

Molecular Weight = 621.49 gm

Magnesium 35.20 % Mg 58.37 % MgO

Silicon 18.08 % Si 38.67 % SiO₂

Hydrogen 0.29 % H 2.61 % H₂O

Oxygen 45.82 % O

Fluorine 0.61 % F 0.61 % F

- % F -0.26 % -O=F₂

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

Mg₉(SiO₄)₄(OH)_1.8F_0.2

Environment:

Occurs in Mg-skarn (chaliphyric) rims around dolomitic marble xenoliths in gabbroic rocks and associated Fe-Ti ores. A member of the humite group

IMA Status:

Approved IMA 1998 (Dana # Added)

Locality:

Zelentsovskaya mine on the southern slopes of the western Urals, Russia. Link to MinDat.org Location Data.

Name Origin:

Named for its composition and the mineral clinohumite.

Name Pronunciation:

Hydroxylclinohumite + Pronunciation

Synonym:

IMA1998-065

Hydroxylclinohumite Image

Images:

Hydroxylclinohumite

Comments: Deep red tabular hydroxylclinohumite crystal.
Location: Koksha Valley, Badakshan Province, Afghanistan. Scale: See Image.
© Rruff Database

Hydroxylclinohumite Crystallography

Axial Ratios:

a:b:c =2.8831:1:2.1636

Cell Dimensions:

a = 13.6894, b = 4.748, c = 10.273, Z = 3; beta = 100.72° V = 656.06 Den(Calc)= 4.72

Crystal System:

Monoclinic - Prismatic H-M Symbol (2/m) Space Group: P 2₁/c

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

By Intensity(I/I_o): 2.269(1)(512), 3.72(0.95)(202), 2.259(0.95)(114), 2.516(0.93)(313), 2.772(0.91)(113), 2.551(0.8)(411), 1.747(0.79)(422,522,124)

Physical Properties of Hydroxylclinohumite

Cleavage:

None

Color:

Yellow orange, Pale yellow.

Density:

3.13

Diaphaneity:

Transparent to Translucent

Fracture:

Conchoidal - Uneven - Uneven fracture producing small, conchoidal fragments.

Habit:

Granular - Generally occurs as anhedral to subhedral crystals in matrix.

Hardness:

6.5 - Pyrite

Luster:

Vitreous - Dull

Streak:

white

Optical Properties of Hydroxylclinohumite

Gladstone-Dale:

CI meas= 0.001 (Superior) - where the CI = (1-KPDmeas/KC)
CI calc= 0.337 (Poor) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1367,KPDmeas= 0.2062,KC= 0.2063
Ncalc = 1.65 - 1.97

Optical Data:

Biaxial (+), a=1.631, b=1.641, g=1.664, bire=0.0330, 2V(Calc)=68, 2V(Meas)=70. Dispersion weak.

Calculated Properties of Hydroxylclinohumite

Electron Density:

Bulk Density (Electron Density)=3.12 gm/cc
note: Specific Gravity of Hydroxylclinohumite =3.13 gm/cc.

Fermion Index:

Fermion Index = 0.04
Boson Index = 0.96

Photoelectric:

PE_{Hydroxylclinohumite}= 1.48 barns/electron
U=PE_{Hydroxylclinohumite} x rElectron Density= 4.62 barns/cc.

Radioactivity:

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

Hydroxylclinohumite Classification

Dana Class:

52.03.02d.04 (52)Nesosilicate Insular SiO4 Groups and O, OH, F, and H2O

(52.03)with cations in [6] coordination only

(52.03.02d)Humite group (Clinohumite series)

52.03.02d.01 Clinohumite (Mg,Fe)9(SiO4)4(F,OH)2 P 2₁/c 2/m

52.03.02d.02 Jerrygibbsite (Mn,Zn)9(SiO4)4(OH)2 Pbn21 mm2

52.03.02d.03 Sonolite Mn9(SiO4)4(OH,F)2 P 2₁/a 2/m

52.03.02d.04 Hydroxylclinohumite! Mg9(SiO4)4(OH,F)2 P 2₁/c 2/m

Strunz Class:

09.AF.55 09 - SILICATES (Germanates)

09.A - Nesosilicates

09.AF -Nesosilicates with additional anions;

09.AF.55 Clinohumite (Mg,Fe)9(SiO4)4(F,OH)2 P 2₁/c 2/m

09.AF.55 Sonolite Mn9(SiO4)4(OH,F)2 P 2₁/a 2/m

09.AF.55 Hydroxylclinohumite! Mg9(SiO4)4(OH,F)2 P 2₁/c 2/m

Other Hydroxylclinohumite Information

References:

NAME( AmMin, Vol 85, p 1843) PHYS. PROP.(AmMin, Vol 85, p 1843) OPTIC PROP.(AmMin, Vol 85, p 1843)

See Also:

Links to other databases for Hydroxylclinohumite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - GeoScienceWorld
4 - Google Images
5 - Google Scholar
6 - MinDAT
7 - Mineralienatlas (Deutsch)
8 - Online Mineral Museum
9 - QUT Mineral Atlas
10 - Ruff.Info
11 - WWW-MINCRYST

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Hydroxylclinohumite

Mg9(SiO4)4(OH,F)2
Dana No: 52.03.02d.04 Strunz No: 09.AF.55
Locality:

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