Magnesioclinoholmquistite Mineral Data

General Magnesioclinoholmquistite Information

Chemical Formula:

Li2(Mg,Fe++)3Al2Si8O22(OH)2

Composition:

Molecular Weight = 782.99 gm

Lithium 1.77 % Li 3.82 % Li₂O

Magnesium 6.21 % Mg 10.30 % MgO

Aluminum 6.89 % Al 13.02 % Al₂O₃

Iron 7.13 % Fe 9.18 % FeO

Silicon 28.70 % Si 61.39 % SiO₂

Hydrogen 0.26 % H 2.30 % H₂O

Oxygen 49.04 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

Li₂Mg₂Fe²⁺Al₂(Si₈O₂₂)(OH)₂

Environment:

Crystals in a pegmatite. Dimorphous with magnesioholmquistite, forms a series with clinohomquistite and ferroclinoholmquistite.

IMA Status:

Discredited IMA (1997,2005)

Locality:

Unspecified locality in Siberia, Russia. Link to MinDat.org Location Data.

Name Origin:

Named for its composition, monoclinic crystal structure, and relationship with holmsquisite. Discredited as clinoholmquistite (1997). Clinohomsquisite discredited (2005).

Synonym:

Discredited IMA 1997

Magnesioclinoholmquistite 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

Magnesioclinoholmquistite 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)= 2.97

Crystal System:

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

Physical Properties of Magnesioclinoholmquistite

Cleavage:

{???} Good

Color:

Blue violet, Gray, Gray violet, Light blue.

Density:

3.02

Habit:

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

Hardness:

5-6 - Between Apatite and Orthoclase

Optical Properties of Magnesioclinoholmquistite

Optical Data:

NCalc= 1.63 - from Gladstone-Dale relationship (KC = 0.212) where Ncalc=Dcalc*KC+1
NCalc= 1.64 - from Gladstone-Dale relationship (KC = 0.212) where Ncalc=Dmeas*KC+1

Calculated Properties of Magnesioclinoholmquistite

Electron Density:

Bulk Density (Electron Density)=2.94 gm/cc
note: Specific Gravity of Magnesioclinoholmquistite =2.97 gm/cc.

Fermion Index:

Fermion Index = 0.02
Boson Index = 0.98

Photoelectric:

PE_{Magnesioclinoholmquistite}= 3.56 barns/electron
U=PE_{Magnesioclinoholmquistite} x rElectron Density= 10.46 barns/cc.

Radioactivity:

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

Magnesioclinoholmquistite Classification

Dana Class:

66.01.01.06 (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 Magnesioclinoholmquistite Information

References:

NAME( Dana8, CanMin 35:219, 90:732)

See Also:

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

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Magnesioclinoholmquistite

Li2(Mg,Fe++)3Al2Si8O22(OH)2
Dana No: 66.01.01.06 Strunz No: 09.DD.05
Locality:

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