General Holmquistite Information
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Chemical Formula: |
[ ](Li2Mg3Al2)Si8O22(OH)2 |
Composition: |
Molecular Weight = 751.45 gm |
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Lithium 1.85 % Li 3.98 % Li2O |
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Magnesium 9.70 % Mg 16.09 % MgO |
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Aluminum 7.18 % Al 13.57 % Al2O3 |
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Silicon 29.90 % Si 63.97 % SiO2 |
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Hydrogen 0.27 % H 2.40 % H2O |
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Oxygen 51.10 % O |
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______ ______ |
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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 |
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PDF 13-401 |
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Holmquistite Image |
Images:
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Holmquistite Crystallography
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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 |
X Ray Diffraction: |
By Intensity(I/Io): 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
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[2]
[3]
[4]
[5]
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Physical Properties of Holmquistite
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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 |
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Optical Properties of Holmquistite
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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. |
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Calculated Properties of Holmquistite
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Electron Density: |
relectron=2.90 gm/cc note: rHolmquistite =2.91 gm/cc. |
Fermion Index |
Fermion Index = 0.02529 Boson Index = 0.97471 |
Photoelectric: |
PEHolmquistite = 1.59 barns/electron U=PEHolmquistite x relectron= 4.61 barns/cc. |
Radioactivity: |
GRapi = 0 (Gamma Ray American Petroleum Institute Units) Holmquistite is Not Radioactive |
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Holmquistite Classification
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Dana Class: |
66.1.2.10 (66)Inosilicate Double-Width Unbranched Chains, W=2 |
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(66.1)Dana Type |
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(66.1.2)Group 1, the Mg-Fe-Mn-Li amphiboles (Orthorhombic) |
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66.1.2.1 Magnesioanthophyllite? (Mg,Fe)7Si8O22(OH)2 P nma 2/m 2/m 2/m |
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66.1.2.2 Anthophyllite []Mg7Si8O22(OH)2 P nma 2/m 2/m 2/m |
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66.1.2.2a Protoanthophyllite! (Mg,Fe)7Si8O22(OH)2 Pnmn 2/m 2/m 2/m |
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66.1.2.3 Ferro-anthophyllite []Fe7Si8O22(OH)2 P nma 2/m 2/m 2/m |
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66.1.2.3a Protoferro-anthophyllite! (Fe,Mn)2(Fe,Mg)5(Si4O11)2(OH)2 Pnmn 2/m 2/m 2/m |
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66.1.2.3b Protomangano-ferro-anthophyllite! (Mn,Fe)2(Fe,Mg)5(Si4O11)2(OH)2 Pnmn 2/m 2/m 2/m |
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66.1.2.4 Sodicanthophyllite NaMg7Si8O22(OH)2 P nma 2/m 2/m 2/m |
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66.1.2.4a Sodic-ferro-anthophyllite! NaFe7Si8O22(OH)2 P nma 2/m 2/m 2/m |
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66.1.2.5 Magnesiogedrite? (Mg,Fe)5Al2Si6Al2O22(OH)2 P nma 2/m 2/m 2/m |
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66.1.2.6 Gedrite []Mg5Al2Si6Al2O22(OH)2 P nma 2/m 2/m 2/m |
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66.1.2.7 Ferrogedrite []Fe5Al2Si6Al2O22(OH)2 P nma 2/m 2/m 2/m |
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66.1.2.7a Sodic-ferrogedrite! NaFe6AlSi6Al2O22(OH)2 P nma 2/m 2/m 2/m |
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66.1.2.8 Sodicgedrite NaMg6AlSi6Al2O22(OH)2 P nma 2/m 2/m 2/m |
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66.1.2.9 Magnesioholmquistite Li2(Mg,Fe)3Al2Si8O22(OH)2 P nma 2/m 2/m 2/m |
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66.1.2.10 Holmquistite [](Li2Mg3Al2)Si8O22(OH)2 P nma 2/m 2/m 2/m |
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66.1.2.11 Ferroholmquistite [](Li2Fe3Al2)Si8O22(OH)2 P nma 2/m 2/m 2/m |
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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 |
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VIII/F - Inosilicates (chain and band) double chains [Si4O11]6-, Orthorhombic Amphiboles |
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VIII/F.12 - Amphibole group, Magnesioholmquistite - Ferrogedrite series |
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VIII/F.12-10 Magnesioholmquistite Li2(Mg,Fe)3Al2Si8O22(OH)2 P nma 2/m 2/m 2/m |
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VIII/F.12-20 Holmquistite [](Li2Mg3Al2)Si8O22(OH)2 P nma 2/m 2/m 2/m |
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VIII/F.12-30 Ferroholmquistite [](Li2Fe3Al2)Si8O22(OH)2 P nma 2/m 2/m 2/m |
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VIII/F.12-40 Sodicanthophyllite NaMg7Si8O22(OH)2 P nma 2/m 2/m 2/m |
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VIII/F.12-45 Sodic-ferro-anthophyllite! NaFe7Si8O22(OH)2 P nma 2/m 2/m 2/m |
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VIII/F.12-50 Magnesioanthophyllite? (Mg,Fe)7Si8O22(OH)2 P nma 2/m 2/m 2/m |
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VIII/F.12-60 Anthophyllite []Mg7Si8O22(OH)2 P nma 2/m 2/m 2/m |
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VIII/F.12-70 Ferro-anthophyllite []Fe7Si8O22(OH)2 P nma 2/m 2/m 2/m |
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VIII/F.12-75 Sodic-ferrogedrite! NaFe6AlSi6Al2O22(OH)2 P nma 2/m 2/m 2/m |
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VIII/F.12-80 Sodicgedrite NaMg6AlSi6Al2O22(OH)2 P nma 2/m 2/m 2/m |
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VIII/F.12-90 Magnesiogedrite? (Mg,Fe)5Al2Si6Al2O22(OH)2 P nma 2/m 2/m 2/m |
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VIII/F.12-100 Gedrite []Mg5Al2Si6Al2O22(OH)2 P nma 2/m 2/m 2/m |
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VIII/F.12-110 Ferrogedrite []Fe5Al2Si6Al2O22(OH)2 P nma 2/m 2/m 2/m |
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VIII/F.12-130 Protoferro-anthophyllite! (Fe,Mn)2(Fe,Mg)5(Si4O11)2(OH)2 Pnmn 2/m 2/m 2/m |
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VIII/F.12-140* Protoanthophyllite! (Mg,Fe)7Si8O22(OH)2 Pnmn 2/m 2/m 2/m |
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VIII/F.12-140 Protomangano-ferro-anthophyllite! (Mn,Fe)2(Fe,Mg)5(Si4O11)2(OH)2 Pnmn 2/m 2/m 2/m |
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Other Holmquistite Information
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References: |
NAME( Dana8) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Dana8) |
See Also: |
Links to other databases for Holmquistite :
1 -Am. Min. Crystal Structure Database
2 -Athena
3 - Crocoite.com Mineral Locations
4 - EUROmin Project
5 -Google Images
6 -Google Scholar
7 -Handbook of Mineralogy (MinSocAm)
8 -Handbook of Mineralogy (UofA)
9 -MinDAT
10 -MinMax(Deutsch)
11 -MinMax(English)
12 -Mineralienatlas (Deutsch)
13 -QUT Mineral Atlas
14 - WWW-MINCRYST
15 -École des Mines de Paris
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Print or Cut-and-Paste your Holmquistite Specimen Label here :
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Holmquistite
[ ](Li2Mg3Al2)Si8O22(OH)2
Dana No: 66.1.2.10 Strunz No: VIII/F.12-20
Locality:
Notes:
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