Holmquistite Mineral Data

Holmquistite Mineral Data +

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General Holmquistite Information

Chemical Formula:

[ ](Li2Mg3Al2)Si8O22(OH)2

Composition:

Molecular Weight = 751.45 gm

Lithium 1.85 % Li 3.98 % Li₂O

Magnesium 9.70 % Mg 16.09 % MgO

Aluminum 7.18 % Al 13.57 % Al₂O₃

Silicon 29.90 % Si 63.97 % SiO₂

Hydrogen 0.27 % H 2.40 % H₂O

Oxygen 51.10 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

Li₂Mg₃Al₂(Si₈O₂₂)(OH)₂

Environment:

Wall rock and contact zones of lithian pegmatites with basic or ultrabasic country rock.

IMA Status:

Valid Species (Pre-IMA) 1913

Locality:

Uto Island, Sondermanland, Sweden. Link to MinDat.org Location Data.

Name Origin:

Named for Per Johan Holmquist (1866-1946), petrologist, Stockhom, Sweden.

Synonym:

ICSD 65421

PDF 13-401

Holmquistite Image

Images:

Holmquistite

Comments: Greenish-black prismatic crystals of holmquistite in matrix.
Location: Uto, Sodermanland, Sweden. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Holmquistite Crystallography

Axial Ratios:

a:b:c =1.0344:1:0.2996

Cell Dimensions:

a = 18.3, b = 17.69, c = 5.3, Z = 4; V = 1,715.75 Den(Calc)= 2.91

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): 8.107(1), 3(0.9), 4.427(0.7),

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: HS 119915 Siberia

View Additional jPOWD Structure files for Holmquistite
[1] [2] [3] [4] [5]

Physical Properties of Holmquistite

Cleavage:

[210] Perfect

Color:

Blue, Violet, Light blue, Dark violet, Black.

Density:

3.06 - 3.13, Average = 3.09

Diaphaniety:

Transparent to Translucent

Habit:

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

Hardness:

5.5 - Knife Blade

Luster:

Vitreous (Glassy)

Streak:

bluish white

Optical Properties of Holmquistite

Gladstone-Dale:

CI meas= 0.035 (Excellent) - where the CI = (1-KPDmeas/KC)
CI calc= -0.026 (Excellent) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2193,KPDmeas= 0.2062,KC= 0.2137

Optical Data:

Biaxial (-), a=1.613-1.625, b=1.634-1.645, g=1.646-1.666, bire=0.0330-0.0410, 2V(Calc)=72-90, 2V(Meas)=49.

Pleochroism (x):

colorless or yellowish green.

Pleochroism (y):

colorless or yellowish green.

Pleochroism (z):

blue or violet.

Calculated Properties of Holmquistite

Electron Density:

r_electron=2.90 gm/cc
note: r_Holmquistite=2.91 gm/cc.

Fermion Index

Fermion Index = 0.02529
Boson Index = 0.97471

Photoelectric:

PE_Holmquistite= 1.59 barns/electron
U=PE_Holmquistite x r_electron= 4.61 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Holmquistite is Not Radioactive

Holmquistite Classification

Dana Class:

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

(66.1)Dana Type

(66.1.2)Group 1, the Mg-Fe-Mn-Li amphiboles (Orthorhombic)

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

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

66.1.2.2a Protoanthophyllite! (Mg,Fe)7Si8O22(OH)2 Pnmn 2/m 2/m 2/m

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

66.1.2.3a Protoferro-anthophyllite! (Fe,Mn)2(Fe,Mg)5(Si4O11)2(OH)2 Pnmn 2/m 2/m 2/m

66.1.2.3b Protomangano-ferro-anthophyllite! (Mn,Fe)2(Fe,Mg)5(Si4O11)2(OH)2 Pnmn 2/m 2/m 2/m

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

66.1.2.4a Sodic-ferro-anthophyllite! NaFe7Si8O22(OH)2 P nma 2/m 2/m 2/m

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

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

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

66.1.2.7a Sodic-ferrogedrite! NaFe6AlSi6Al2O22(OH)2 P nma 2/m 2/m 2/m

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

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

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

66.1.2.11 Ferroholmquistite [](Li2Fe3Al2)Si8O22(OH)2 P nma 2/m 2/m 2/m

66.1.2.12 IMA2004-030! []Li2(Fe3Al2)S5(Si8O22)(OH)2 P nma 2/m 2/m 2/m

Strunz Class:

VIII/F.12-20 VIII - Silicates

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

VIII/F.12 - Amphibole group, Magnesioholmquistite - Ferrogedrite series

VIII/F.12-10 Magnesioholmquistite Li2(Mg,Fe)3Al2Si8O22(OH)2 P nma 2/m 2/m 2/m

VIII/F.12-20 Holmquistite [](Li2Mg3Al2)Si8O22(OH)2 P nma 2/m 2/m 2/m

VIII/F.12-30 Ferroholmquistite [](Li2Fe3Al2)Si8O22(OH)2 P nma 2/m 2/m 2/m

VIII/F.12-40 Sodicanthophyllite NaMg7Si8O22(OH)2 P nma 2/m 2/m 2/m

VIII/F.12-45 Sodic-ferro-anthophyllite! NaFe7Si8O22(OH)2 P nma 2/m 2/m 2/m

VIII/F.12-50 Magnesioanthophyllite? (Mg,Fe)7Si8O22(OH)2 P nma 2/m 2/m 2/m

VIII/F.12-60 Anthophyllite []Mg7Si8O22(OH)2 P nma 2/m 2/m 2/m

VIII/F.12-70 Ferro-anthophyllite []Fe7Si8O22(OH)2 P nma 2/m 2/m 2/m

VIII/F.12-75 Sodic-ferrogedrite! NaFe6AlSi6Al2O22(OH)2 P nma 2/m 2/m 2/m

VIII/F.12-80 Sodicgedrite NaMg6AlSi6Al2O22(OH)2 P nma 2/m 2/m 2/m

VIII/F.12-90 Magnesiogedrite? (Mg,Fe)5Al2Si6Al2O22(OH)2 P nma 2/m 2/m 2/m

VIII/F.12-100 Gedrite []Mg5Al2Si6Al2O22(OH)2 P nma 2/m 2/m 2/m

VIII/F.12-110 Ferrogedrite []Fe5Al2Si6Al2O22(OH)2 P nma 2/m 2/m 2/m

VIII/F.12-130 Protoferro-anthophyllite! (Fe,Mn)2(Fe,Mg)5(Si4O11)2(OH)2 Pnmn 2/m 2/m 2/m

VIII/F.12-140* Protoanthophyllite! (Mg,Fe)7Si8O22(OH)2 Pnmn 2/m 2/m 2/m

VIII/F.12-140 Protomangano-ferro-anthophyllite! (Mn,Fe)2(Fe,Mg)5(Si4O11)2(OH)2 Pnmn 2/m 2/m 2/m

Other Holmquistite Information

References:

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

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

Holmquistite

[ ](Li2Mg3Al2)Si8O22(OH)2
Dana No: 66.1.2.10 Strunz No: VIII/F.12-20
Locality:

Notes: