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Shirokshinite Mineral Data
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General Shirokshinite Information
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 Chemical Formula: |
K(NaMg2)Si4O10F2 |
| Composition: |
Molecular Weight = 421.03 gm |
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Potassium 9.29 % K 11.19 % K2O |
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Sodium 5.46 % Na 7.36 % Na2O |
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Magnesium 11.55 % Mg 19.15 % MgO |
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Silicon 26.68 % Si 57.08 % SiO2 |
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Oxygen 38.00 % O |
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Fluorine 9.02 % F 9.02 % F |
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- %
F -3.80 % -O=F2 |
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______ ______ |
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100.00 % 100.00 % = TOTAL OXIDE |
| Empirical Formula: |
KNaMg2Si4O10F2 |
| Environment: |
Occurs on microcline and kupletskite in cavities within a hyperalkaline pegmatite. (mica group; structure) |
| IMA Status: |
Approved IMA 2003 (Dana # Added) |
| Locality: |
Khibiny massif, Kola Peninsula, Russia. Link to MinDat.org Location Data. |
| Name Origin: |
Named for Nikolay V. Shirokshin (1809-), Russian geologist who in 1835 published the first geological data for the Khibiny massif. |
| Synonym: |
IMA2001-063 |
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Shirokshinite Image |
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Images:
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Shirokshinite
Comments: Dark-brown columnar shirokshinite crystals with pinkish-brown fine-grained phillosilicate masses on greenish nathrolite.
Location: Kirovskii apatite mine (Kirovsky Mine; Kirov Mine), Kukisvumchorr Mt, Khibiny Massif, Kola Peninsula, Murmanskaja Oblast', Northern Region, Russia.
Scale: FOV is 12x10 mm.
© Pavel M. Kartashov |
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Shirokshinite Crystallography
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| Axial Ratios: |
a:b:c =0.5808:1:1.122 |
| Cell Dimensions: |
a = 5.269, b = 9.071, c = 10.178, Z = 2; beta = 100.03° V = 479.02 Den(Calc)= 2.92 |
| Crystal System: |
Monoclinic - Prismatic H-M Symbol (2/m) Space Group: C 2/m |
| X Ray Diffraction: |
By Intensity(I/Io): 1.522(1)(206,135,331,062.41(1)(201,132), 3.36(0.9)(022,003),
1.665(0.8)(204,135), 10(0.7)(001), 1359(0.6)(207,136,046), 2.14(0.6)(202,133) |
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Physical Properties of Shirokshinite
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| Cleavage: |
{001} Perfect |
| Color: |
Colorless, Pale gray. |
| Diaphaneity: |
Transparent to Translucent |
| Fracture: |
Flexible - Flexible fragments. |
| Habit: |
Prismatic - Crystals Shaped like Slender Prisms (e.g. tourmaline). |
| Habit: |
Pseudo Hexagonal - Crystals show a hexagonal outline. |
| Habit: |
Skeletal - Crystals form crude outlines with missing faces. |
| Hardness: |
2.5 - Finger Nail |
| Luster: |
Vitreous - Pearly |
| Streak: |
white |
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Optical Properties of Shirokshinite
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| Gladstone-Dale: |
CI calc= 0.055 (Good) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1863,KC= 0.1972
Ncalc = 1.58 |
| Optical Data: |
Biaxial (-), a=1.526, b=1.553, g=1.553, bire=0.0270 |
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Calculated Properties of Shirokshinite
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| Electron Density: |
Bulk Density (Electron Density)=2.89 gm/cc
note: Specific Gravity of Shirokshinite =2.92 gm/cc.
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| Fermion Index: |
Fermion Index = 0.02
Boson Index = 0.98 |
| Photoelectric: |
PEShirokshinite = 2.34 barns/electron
U=PEShirokshinite x relectron= 6.76 barns/cc.
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| Radioactivity: |
GRapi = 132.40 (Gamma Ray American Petroleum Institute Units)
Concentration of Shirokshinite per GRapi unit = 0.76 (%)
Estimated Radioactivity from Shirokshinite  - barely detectable
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Shirokshinite Classification
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| Dana Class: |
71.02.02a.12 (71)Phyllosilicate Sheets of Six-Membered Rings |
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(71.02)with 2:1 Layers |
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(71.02.02a)Mica Group (Muscovite subgroup) |
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71.02.02a.01 Muscovite KAl2(Si3Al)O10(OH,F)2 C 2/m 2/m |
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71.02.02a.02 Paragonite NaAl2(Si3Al)O10(OH)2 C 2/c,Cc Mono |
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71.02.02a.03 Chernykhite (Ba,Na)V,Al)2(Si,Al)4O10(OH)2 C 2/c 2/m |
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71.02.02a.04 Roscoelite K(V,Al,Mg)2AlSi3O10(OH)2 C 2/m 2/m |
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71.02.02a.05 Glauconite (K,Na)(Fe,Al,Mg)2(Si,Al)4O10(OH)2 C 2/m 2/m |
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71.02.02a.06 Celadonite K(Mg,Fe)(Fe,Al)[Si4O10](OH)2 C 2/m 2/m |
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71.02.02a.06b Ferroceladonite! K2FeFeSi8O20(OH)4 C 2/m 2/m |
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71.02.02a.06c Ferroaluminoceladonite! K2Fe2Al2Si8O20(OH)4 C 2/m 2/m |
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71.02.02a.06d Aluminoceladonite! KAl(Mg,Fe)[]Si4O10(OH)2 2/m |
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71.02.02a.06e Chromceladonite! KCrMg(Si4O10)(OH)2 C 2 2 |
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71.02.02a.07 Tobelite (NH4,K)Al2(Si3Al)O10(OH)2 C 2/m 2/m |
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71.02.02a.08 Nanpingite Cs(Al,Mg,Fe,Li)2(Si3Al)O10(OH,F)2 C 2/c 2/m |
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71.02.02a.09 Boromuscovite KAl2(Si3B)O10(OH,F)2 C 2/m 2/m |
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71.02.02a.10 Montdorite (K,Na)(Fe,Mn,Mg)2.5[Si4O10](F,OH)2 C 2/c 2/m |
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71.02.02a.11 Chromphyllite! (K,Ba)(Cr,Al)2[AlSi3O10](OH,F)2 C 2c 2/m |
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71.02.02a.12 Shirokshinite! K(NaMg2)Si4O10F2 C 2/m 2/m |
| Strunz Class: |
09.EC.20 09 - SILICATES (Germanates) |
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09.E - Phyllosilicates |
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09.EC -Phyllosilicates with mica sheets, composed of tetrahedral and octahedral nets |
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09.EC.20 Annite KFe3AlSi3O10(OH,F)2 C 2/m 2/m |
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09.EC.20 Biotite* K(Mg,Fe)3[AlSi3O10(OH,F)2 C 2/m 2/m |
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09.EC.20 Hendricksite K(Zn,Mg,Mn)3Si3AlO10(OH)2 C 2/m 2/m |
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09.EC.20 Ephesite NaLiAl2(Al2Si2)O10(OH)2 C 2/c 2/m |
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09.EC.20 Aspidolite NaMg3AlSi3O10(OH)2 C 2/m 2/m |
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09.EC.20 Lepidolite K(Li,Al)3(Si,Al)4O10(F,OH)2 C 2/m,Cm Mono |
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09.EC.20 Preiswerkite NaMg2Al3Si2O10(OH)2 C 2/m 2/m |
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09.EC.20 Masutomilite K(Li,Al,Mn)3[(Si,Al)4O10](F,OH)2 C 2/m 2/m |
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09.EC.20 Wonesite (Na,K).5(Mg,Fe,Al)3(Si,Al)4O10(OH,F)2 C 2/m 2/m |
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09.EC.20 Polylithionite KLi2AlSi4O10(F,OH)2 C 2/m 2/m |
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09.EC.20 Phlogopite KMg3(Si3Al)O10(F,OH)2 C 2/m 2/m |
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09.EC.20 Norrishite K(Mn2Li)Si4O10(O)2 C 2/m 2/m |
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09.EC.20 Siderophyllite KFe2Al(Al2Si2)O10(F,OH)2 C 2/m 2/m |
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09.EC.20 Fluorannite! KFe3AlSi3O10F2 C 2/m 2/m |
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09.EC.20 Shirokshinite! K(NaMg2)Si4O10F2 C 2/m 2/m |
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09.EC.20 Zinnwaldite KLiFeAl(AlSi3)O10(F,OH)2 C 2/m 2/m |
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09.EC.20 Eastonite! KMg2Al[Al2Si2O10](OH)2 2/m |
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09.EC.20 Tetraferriannite K(Fe,Mg)3(Fe,Al)Si3O10(OH)2 C 2/m 2/m |
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09.EC.20 Tetraferriphlogopite! KMg3FeSi3O10(OH)2 2/m |
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09.EC.20 Trilithionite! KLi1.5Al1.5AlSi3O10F2 C 2/m 2/m |
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09.EC.20 Sokolovaite! CsLi2AlSi4O10F2 C 2/m, C 2 or Cm Mono |
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09.EC.20 Shirozulite! KMn3(AlSi3)O10(OH,F)2 C 2/m 2/m |
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09.EC.20 Suhailite! (NH4)Fe3(Si3Al)O10(OH)2 C 2/m? 2/m |
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09.EC.20 Fluorophlogopite! KMg3(AlSi3)O10F2 C 2/m 2/m |
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Other Shirokshinite Information
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| References: |
NAME( AmMin, v 88, p 251) PHYS. PROP.(AmMin, v 88, p 251) OPTIC PROP.(AmMin, v 88, p 251) |
| See Also: |
Links to other databases for Shirokshinite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - GeoScienceWorld
4 - Google Images
5 - Google Scholar
6 - MinDAT
7 - Mineralienatlas (Deutsch)
8 - Online Mineral Museum
9 - QUT Mineral Atlas
10 - Ruff.Info
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Shirokshinite
K(NaMg2)Si4O10F2
Dana No: 71.02.02a.12 Strunz No: 09.EC.20
Locality:
Notes:
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