Magnesioclinoholmquistite Mineral Data

Magnesioclinoholmquistite Mineral Data

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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:

Click Here for Larger Magnesioclinoholmquistite Image

Magnesioclinoholmquistite Clinoholmquistite 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 - PrismaticH-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:

r_electron=2.94 gm/cc
note: r_{Magnesioclinoholmquistite}=2.97 gm/cc.

Fermion Index

Fermion Index = 0.02268
Boson Index = 0.97732

Photoelectric:

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

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Magnesioclinoholmquistite is Not Radioactive

Magnesioclinoholmquistite Classification

Dana Class:

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

(66.1)Dana Type

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

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

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

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

66.1.1.3b Permanganogrunerite! []Mn4(Fe)3(Si8O22)(OH)2 C 2/m 2/m

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

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

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

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

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

66.1.1.8a Ferri-clinoholmquistite! []Li2Mg3(Fe3)2(Si8O22)(OH)2 C 2/m 2/m

66.1.1.8b Ferri-clinoferroholmquistite! []Li2(Fe2Fe3)Si8O22(OH)2 C 2/m 2/m

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

66.1.1.9a Ferripedrizite! NaLi2(Fe2Mg2Li)Si8O22(OH)2 C 2/m 2/m

66.1.1.9b Sodic-ferri-ferropedrizite! NaLi2(Fe2Fe3)Si8O22(OH)2 C 2/m 2/m

66.1.1.9c Fluoro-sodic-pedrizite! NaLi2(Mg2Al2Li)S5Si8O22F2 C 2/m 2/m

Strunz Class:

VIII/F.07-60 VIII - Silicates

VIII/F - Inosilicates (chain and band) double chains [Si4O11]6- , Mg-Fe-Mn-Amphiboles

VIII/F.07 - Amphibole group, Magnesiocummingtonite - Ferroclinoholmquistite series

VIII/F.07-10 Magnesiocummingtonite (Mg,Fe)7Si8O22(OH)2 C 2/m 2/m

VIII/F.07-20 Cummingtonite []Mg7Si8O22(OH)2 C 2/m 2/m

VIII/F.07-30 Grunerite []Fe7Si8O22(OH)2 C 2/m 2/m

VIII/F.07-40 Manganocummingtonite Na(Na,Mn)2(Mg4,Fe)5Si8O22(OH)2 C 2/m 2/m

VIII/F.07-50 Manganogrunerite []Mn2Fe5Si8O22(OH) C 2/m 2/m

VIII/F.07-55 Permanganogrunerite! []Mn4(Fe)3(Si8O22)(OH)2 C 2/m 2/m

VIII/F.07-60 Magnesioclinoholmquistite Li2(Mg,Fe)3Al2Si8O22(OH)2 C 2/m 2/m

VIII/F.07-70 Clinoholmquistite? [](Li2Mg3Al2)Si8O22(OH)2 C 2/m 2/m

VIII/F.07-80 Clinoferroholmquistite [](Li2Fe3Al2)Si8O22(OH)2 C 2/m 2/m

VIII/F.07-90 Ferri-clinoferroholmquistite! []Li2(Fe2Fe3)Si8O22(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 -Google Images 4 -Google Scholar 5 -MinDAT 6 -MinMax(Deutsch) 7 -MinMax(English) 8 -Mineralienatlas (Deutsch) 9 -QUT Mineral Atlas 10 -École des Mines de Paris

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

Magnesioclinoholmquistite

Li2(Mg,Fe++)3Al2Si8O22(OH)2
Dana No: 66.1.1.6 Strunz No: VIII/F.07-60
Locality:

Notes: