Magnesioholmquistite Mineral Data

General Magnesioholmquistite 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

IMA Status:

Approved IMA 1978

Locality:

Link to MinDat.org Location Data.

Name Origin:

The name reflects its composition and relationship to holmquistite..

Magnesioholmquistite Image

Images:

Holmquistite Magnesioholmquistite

Comments: Dark blue thin bladed crystals of holmquistite (magnesioholmquistite) in amphibolite.
Location: Uto, Sodermanland, Sweden. Scale: See Image.
© Rruff Database

Magnesioholmquistite Crystallography

Crystal System:

Orthorhombic - Dipyramidal H-M Symbol (2/m 2/m 2/m) Space Group: P nma

Physical Properties of Magnesioholmquistite

Cleavage:

{???} Good

Color:

Violet, Gray blue.

Hardness:

5-6 - Between Apatite and Orthoclase

Optical Properties of Magnesioholmquistite

Optical Data:

Calculated Properties of Magnesioholmquistite

Fermion Index:

Fermion Index = 0.02
Boson Index = 0.98

Photoelectric:

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

Radioactivity:

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

Magnesioholmquistite Classification

Dana Class:

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

(66.01)with P=2 amphibole configuration

(66.01.02)Dana Group

66.01.02.01 Magnesioanthophyllite? (Mg,Fe)7Si8O22(OH)2 P nma 2/m 2/m 2/m

66.01.02.02 Anthophyllite []Mg7Si8O22(OH)2 P nma 2/m 2/m 2/m

66.01.02.02a Protoanthophyllite! (Mg,Fe)7Si8O22(OH)2 Pnmn 2/m 2/m 2/m

66.01.02.03 Ferro-anthophyllite []Fe7Si8O22(OH)2 P nma 2/m 2/m 2/m

66.01.02.03a Protoferro-anthophyllite! (Fe,Mn)2(Fe,Mg)5(Si4O11)2(OH)2 Pnmn 2/m 2/m 2/m

66.01.02.03b Protomangano-ferro-anthophyllite! (Mn,Fe)2(Fe,Mg)5(Si4O11)2(OH)2 Pnmn 2/m 2/m 2/m

66.01.02.04 Sodicanthophyllite NaMg7Si8O22(OH)2 P nma 2/m 2/m 2/m

66.01.02.04a Sodic-ferro-anthophyllite! NaFe7Si8O22(OH)2 P nma 2/m 2/m 2/m

66.01.02.05 Magnesiogedrite? (Mg,Fe)5Al2Si6Al2O22(OH)2 P nma 2/m 2/m 2/m

66.01.02.06 Gedrite []Mg5Al2Si6Al2O22(OH)2 P nma 2/m 2/m 2/m

66.01.02.07 Ferrogedrite []Fe5Al2Si6Al2O22(OH)2 P nma 2/m 2/m 2/m

66.01.02.07a Sodic-ferrogedrite! NaFe6AlSi6Al2O22(OH)2 P nma 2/m 2/m 2/m

66.01.02.08 Sodicgedrite NaMg6AlSi6Al2O22(OH)2 P nma 2/m 2/m 2/m

66.01.02.09 Magnesioholmquistite Li2(Mg,Fe)3Al2Si8O22(OH)2 P nma 2/m 2/m 2/m

66.01.02.10 Holmquistite [](Li2Mg3Al2)Si8O22(OH)2 P nma 2/m 2/m 2/m

66.01.02.11 Ferroholmquistite [](Li2Fe3Al2)Si8O22(OH)2 P nma 2/m 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 Magnesioholmquistite Information

See Also:

Links to other databases for Magnesioholmquistite :
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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Magnesioholmquistite

Li2(Mg,Fe++)3Al2Si8O22(OH)2
Dana No: 66.01.02.09 Strunz No: 09.DD.05
Locality:

Notes:

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