Ferroholmquistite Mineral Data

General Ferroholmquistite Information

Chemical Formula:

[ ](Li2Fe++3Al2)Si8O22(OH)2

Composition:

Molecular Weight = 808.43 gm

Potassium 0.05 % K 0.06 % K₂O

Sodium 0.11 % Na 0.15 % Na₂O

Lithium 1.61 % Li 3.47 % Li₂O

Magnesium 4.42 % Mg 7.33 % MgO

Manganese 0.14 % Mn 0.18 % MnO

Aluminum 6.31 % Al 11.92 % Al₂O₃

Iron 11.81 % Fe 15.20 % FeO

Silicon 27.79 % Si 59.46 % SiO₂

Hydrogen 0.25 % H 2.20 % H₂O

Oxygen 47.44 % O

Fluorine 0.07 % F 0.07 % F

- % F -0.03 % -O=F₂

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

K_0.01Na_0.01Li_1.88Mg_0.08Na_0.03Fe²⁺_0.01Al_1.89Fe²⁺_1.7Mg_1.39Mn²⁺_0.02Si₈O₂₂(OH)_1.97F_0.03

Environment:

Metasomatism around highly fractionated lithium-rich pegmatites that intrude amphibolites.

IMA Status:

Approved IMA 1978

Locality:

Greenbushes pegmatite (Western Australia). Link to MinDat.org Location Data.

Name Origin:

The name reflects its composition and relationship to holmquistite..

Name Pronunciation:

Ferroholmquistite + Pronunciation

Synonym:

IMA2004-030

Ferroholmquistite Image

Images:

Ferroholmquistite

Comments: Dark green ferroholmquistite, with silvery luster, prismatic crystalline ferroholmquistite in cesium rich reddish brown biotite.
Location: Goltsy, Eastern Sayan Mountains, Krasnoyarsk Territory, Siberia, Russia. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Ferroholmquistite Crystallography

Axial Ratios:

a:b:c =1.0338:1:0.2994

Cell Dimensions:

a = 18.3, b = 17.7, c = 5.3, Z = 4; V = 1,716.72 Den(Calc)= 3.13

Crystal System:

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

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

By Intensity(I/I_o): 8.11(1), 3(0.48), 4.42(0.26),2.797(0.17), 2.648(0.14), 3.62(0.13), 2.536(0.11),

Crystal Structure:

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Camara F , Oberti R , American Mineralogist , 90 (2005) p.1167-1176, The crystal-chemistry of holmquistites: Ferroholmquistite from, Greenbushes (Western Australia) and, hints for compositional constraints in B-Li amphiboles, Sample: Greenbushes, W Australia

Physical Properties of Ferroholmquistite

Cleavage:

{010} Good, {101} Good

Color:

Black, Bluish violet.

Diaphaneity:

Subtranslucent

Fracture:

Brittle - Generally displayed by glasses and most non-metallic minerals.

Habit:

Acicular - Occurs as needle-like crystals.

Habit:

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

Hardness:

5-6 - Between Apatite and Orthoclase

Luster:

Vitreous (Glassy)

Optical Properties of Ferroholmquistite

Gladstone-Dale:

CI calc= 0.026 (Excellent) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.205,KC= 0.2105
Ncalc = 1.66

Optical Data:

Biaxial (-), a=1.628, b=1.646, g=1.651, bire=0.0230

Pleochroism (x):

colorless.

Pleochroism (y):

pale violet-blue.

Pleochroism (z):

blue to deep violet.

Calculated Properties of Ferroholmquistite

Electron Density:

Bulk Density (Electron Density)=3.09 gm/cc
note: Specific Gravity of Ferroholmquistite =3.13 gm/cc.

Fermion Index:

Fermion Index = 0.02
Boson Index = 0.98

Photoelectric:

PE_{Ferroholmquistite}= 4.89 barns/electron
U=PE_{Ferroholmquistite} x r_electron= 15.12 barns/cc.

Radioactivity:

GRapi = 0.71 (Gamma Ray American Petroleum Institute Units)
Concentration of Ferroholmquistite per GRapi unit =141.67 (%)

Estimated Radioactivity from Ferroholmquistite - barely detectable

Ferroholmquistite Classification

Dana Class:

66.01.02.11 (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.DE.05 09 - SILICATES (Germanates)

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

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

09.DE.05 Ferro-anthophyllite []Fe7Si8O22(OH)2 P nma 2/m 2/m 2/m

09.DE.05 Anthophyllite []Mg7Si8O22(OH)2 P nma 2/m 2/m 2/m

09.DE.05 Ferrogedrite []Fe5Al2Si6Al2O22(OH)2 P nma 2/m 2/m 2/m

09.DE.05 Gedrite []Mg5Al2Si6Al2O22(OH)2 P nma 2/m 2/m 2/m

09.DE.05 Ferroholmquistite [](Li2Fe3Al2)Si8O22(OH)2 P nma 2/m 2/m 2/m

09.DE.05 Holmquistite [](Li2Mg3Al2)Si8O22(OH)2 P nma 2/m 2/m 2/m

09.DE.05 Cummingtonite []Mg7Si8O22(OH)2 C 2/m 2/m

09.DE.05 Clinoferroholmquistite [](Li2Fe3Al2)Si8O22(OH)2 C 2/m 2/m

09.DE.05 Grunerite []Fe7Si8O22(OH)2 C 2/m 2/m

09.DE.05 Magnesiocummingtonite (Mg,Fe)7Si8O22(OH)2 C 2/m 2/m

09.DE.05 Manganogrunerite []Mn2Fe5Si8O22(OH) C 2/m 2/m

09.DE.05 Magnesioanthophyllite? (Mg,Fe)7Si8O22(OH)2 P nma 2/m 2/m 2/m

09.DE.05 Protomangano-ferro-anthophyllite! (Mn,Fe)2(Fe,Mg)5(Si4O11)2(OH)2 Pnmn 2/m 2/m 2/m

09.DE.05 Sodicgedrite NaMg6AlSi6Al2O22(OH)2 P nma 2/m 2/m 2/m

09.DE.05 Sodic-ferro-anthophyllite! NaFe7Si8O22(OH)2 P nma 2/m 2/m 2/m

09.DE.05 Sodic-ferrogedrite! NaFe6AlSi6Al2O22(OH)2 P nma 2/m 2/m 2/m

09.DE.05 Sodicanthophyllite NaMg7Si8O22(OH)2 P nma 2/m 2/m 2/m

09.DE.05 Permanganogrunerite! []Mn4(Fe)3(Si8O22)(OH)2 C 2/m 2/m

09.DE.05 Protoferro-anthophyllite! (Fe,Mn)2(Fe,Mg)5(Si4O11)2(OH)2 Pnmn 2/m 2/m 2/m

09.DE.05 Fluoro-sodic-pedrizite! NaLi2(Mg2Al2Li)S5Si8O22F2 C 2/m 2/m

09.DE.05 Sodic-ferri-ferropedrizite! NaLi2(Fe2Fe3)Si8O22(OH)2 C 2/m 2/m

09.DE.05 Manganocummingtonite Na(Na,Mn)2(Mg4,Fe)5Si8O22(OH)2 C 2/m 2/m

09.DE.05 Protoanthophyllite! (Mg,Fe)7Si8O22(OH)2 Pnmn 2/m 2/m 2/m

09.DE.05 Ferri-clinoferroholmquistite! []Li2(Fe2Fe3)Si8O22(OH)2 C 2/m 2/m

09.DE.05 Sodic-ferripedrizite! Na(LiNa)(Fe2Mg2Li)Si8O22(OH,F)2 C 2/m 2/m

09.DE.05 Ferripedrizite! NaLi2(Fe2Mg2Li)Si8O22(OH)2 C 2/m 2/m

Other Ferroholmquistite Information

References:

NAME( AmMin v90, no7, p1167) PHYS. PROP.(AmMin v90, no7, p1167) OPTIC PROP.(AmMin v90, no7, p1167)

See Also:

Links to other databases for Ferroholmquistite :
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 - MinDAT
9 - Mineralienatlas (Deutsch)
10 - Online Mineral Museum
11 - QUT Mineral Atlas
12 - Ruff.Info

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

Ferroholmquistite

[ ](Li2Fe++3Al2)Si8O22(OH)2
Dana No: 66.01.02.11 Strunz No: 09.DE.05
Locality:

Notes: