Clinoholmquistite Mineral Data

General Clinoholmquistite Information

Chemical Formula:

[ ](Li2Mg3Al2)Si8O22(OH)2

Composition:

Molecular Weight = 794.83 gm

Potassium 0.20 % K 0.24 % K₂O

Sodium 1.30 % Na 1.75 % Na₂O

Lithium 1.63 % Li 3.52 % Li₂O

Calcium 1.31 % Ca 1.83 % CaO

Magnesium 5.90 % Mg 9.79 % MgO

Manganese 0.35 % Mn 0.45 % MnO

Aluminum 7.50 % Al 14.17 % Al₂O₃

Iron 5.13 % Fe 6.15 % FeO / 0.50 % Fe₂O₃

Silicon 28.27 % Si 60.47 % SiO₂

Hydrogen 0.02 % H 0.20 % H₂O

Oxygen 46.62 % O

Fluorine 1.77 % F 1.77 % F

- % F -0.74 % -O=F₂

______ ______

100.00 % 100.10 % = TOTAL OXIDE

Empirical Formula:

Na_0.45Ca_0.05K_0.04Li_1.79Ca_0.21Al_2.21Mg_1.93Fe²⁺_0.68Li_0.08Mn²⁺_0.05Fe³⁺_0.05Si₈O_22.98 F_0.74(OH)_0.18

Environment:

Occurs at the inner contact with lithium pegmatite around oligoclase andesite. Discredited as a mixture of two distinct amphibole compositions, tremolite and a new amphibole end-mem ber, Fluoro-sodic-pedrizite,

IMA Status:

Discredited IMA 2005

Locality:

Tastyg spodumene deposit, Tuva, Siberia, Russia, Link to MinDat.org Location Data.

Name Origin:

Named for its monoclinic crystal structure and relationship with holmsquisite. Approved IMA 1985, Discredited IMA 2005 as being fluoro-sodic-pedrizite.

Synonym:

Discredited - IMA2004-002

Clinoholmquistite Image

Images:

Clinoholmquistite Magnesioclinoholmquistite Fluoro-sodic-pedrizite

Comments: Dark blue fibrous clinoholmquistite with radiating structure, variety magnesioclinoholmquistite. Clinoholmsquitite may be a new aphibole, fluoro-sodic-pedrizite..
Location: Near Murun, Republic of Sakha, Siberia, Russia. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Clinoholmquistite Crystallography

Axial Ratios:

a:b:c =0.5496:1:0.2972

Cell Dimensions:

a = 9.8, b = 17.83, c = 5.3, Z = 2; beta = 109.1° V = 875.11 Den(Calc)= 3.02

Crystal System:

Monoclinic - Prismatic H-M Symbol (2/m) Space Group: C 2/m

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

By Intensity(I/I_o): 7.93(1), 2.99(1), 2.7(1),1.39(0.9), 4.4(0.9), 1.61(0.8), 1.57(0.7), 3.47(0.5),

Physical Properties of Clinoholmquistite

Cleavage:

{110} Good, {110} Good

Color:

Blue gray, Gray lilac.

Density:

Diaphaneity:

Transparent to Translucent

Fracture:

Brittle - Splintery - Brittle fracture leaving splintery fragments.

Habit:

Prismatic - Crystals Shaped like Slender Prisms (e.g. tourmaline).

Hardness:

5-6 - Between Apatite and Orthoclase

Luster:

Vitreous (Glassy)

Streak:

white

Optical Properties of Clinoholmquistite

Gladstone-Dale:

CI meas= 0.004 (Superior) - where the CI = (1-KPDmeas/KC)
CI calc= 0.011 (Superior) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2064,KPDmeas= 0.2078,KC= 0.2087
Ncalc = 1.63

Optical Data:

Biaxial (-), a=1.61, b=1.627, g=1.633, bire=0.0230, 2V(Calc)=60, 2V(Meas)=55-61.

Calculated Properties of Clinoholmquistite

Electron Density:

Bulk Density (Electron Density)=2.96 gm/cc
note: Specific Gravity of Clinoholmquistite =3.00 gm/cc.

Fermion Index:

Fermion Index = 0.02
Boson Index = 0.98

Photoelectric:

PE_{Clinoholmquistite}= 3.26 barns/electron
U=PE_{Clinoholmquistite} x r_electron= 9.66 barns/cc.

Radioactivity:

GRapi = 2.82 (Gamma Ray American Petroleum Institute Units)
Concentration of Clinoholmquistite per GRapi unit = 35.41 (%)

Estimated Radioactivity from Clinoholmquistite - barely detectable

Clinoholmquistite Classification

Dana Class:

66.01.01.07 (66)Inosilicate Double-Width Unbranched Chains, W=2

(66.01)with P=2 amphibole configuration

(66.01.01)Group 1, the Mg-Fe-Mn-Li amphiboles (Monoclinic)

66.01.01.01 Magnesiocummingtonite (Mg,Fe)7Si8O22(OH)2 C 2/m 2/m

66.01.01.02 Cummingtonite []Mg7Si8O22(OH)2 C 2/m 2/m

66.01.01.03 Grunerite []Fe7Si8O22(OH)2 C 2/m 2/m

66.01.01.03b Permanganogrunerite! []Mn4(Fe)3(Si8O22)(OH)2 C 2/m 2/m

66.01.01.04 Manganocummingtonite Na(Na,Mn)2(Mg4,Fe)5Si8O22(OH)2 C 2/m 2/m

66.01.01.05 Manganogrunerite []Mn2Fe5Si8O22(OH) C 2/m 2/m

66.01.01.06 Magnesioclinoholmquistite? Li2(Mg,Fe)3Al2Si8O22(OH)2 C 2/m 2/m

66.01.01.07 Clinoholmquistite? [](Li2Mg3Al2)Si8O22(OH)2 C 2/m 2/m

66.01.01.08 Clinoferroholmquistite [](Li2Fe3Al2)Si8O22(OH)2 C 2/m 2/m

66.01.01.08a Ferri-clinoholmquistite! []Li2Mg3(Fe3)2(Si8O22)(OH)2 C 2/m 2/m

66.01.01.08b Ferri-clinoferroholmquistite! []Li2(Fe2Fe3)Si8O22(OH)2 C 2/m 2/m

66.01.01.09 Sodic-ferripedrizite! Na(LiNa)(Fe2Mg2Li)Si8O22(OH,F)2 C 2/m 2/m

66.01.01.09a Ferripedrizite! NaLi2(Fe2Mg2Li)Si8O22(OH)2 C 2/m 2/m

66.01.01.09b Sodic-ferri-ferropedrizite! NaLi2(Fe2Fe3)Si8O22(OH)2 C 2/m 2/m

66.01.01.09c Fluoro-sodic-pedrizite! NaLi2(Mg2Al2Li)S5Si8O22F2 C 2/m 2/m

Strunz Class:

09.DD.05 09 - SILICATES (Germanates)

09.D - Inosilicates* Structural terminology according to Liebau (1985)

09.DD -Inosilicates with 2-periodic double chains, Si4O11; amphibole family

09.DD.05 Ferri-clinoholmquistite! []Li2Mg3(Fe3)2(Si8O22)(OH)2 C 2/m 2/m

09.DD.05 Clinoholmquistite? [](Li2Mg3Al2)Si8O22(OH)2 C 2/m 2/m

09.DD.05 Magnesiogedrite? (Mg,Fe)5Al2Si6Al2O22(OH)2 P nma 2/m 2/m 2/m

09.DD.05 Magnesioholmquistite Li2(Mg,Fe)3Al2Si8O22(OH)2 P nma 2/m 2/m 2/m

09.DD.05 Magnesioclinoholmquistite? Li2(Mg,Fe)3Al2Si8O22(OH)2 C 2/m 2/m

Other Clinoholmquistite Information

References:

NAME( Dana8, AmMin 90:732) PHYS. PROP.(Dana8, AmMin 90:732) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990)

See Also:

Links to other databases for Clinoholmquistite :
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 - MinDAT
11 - Mineralienatlas (Deutsch)
12 - Online Mineral Museum
13 - QUT Mineral Atlas
14 - Ruff.Info
15 - WWW-MINCRYST

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

Clinoholmquistite

[ ](Li2Mg3Al2)Si8O22(OH)2
Dana No: 66.01.01.07 Strunz No: 09.DD.05
Locality:

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