Shirokshinite Mineral Data

Shirokshinite Mineral Data

General Shirokshinite Information

Chemical Formula:

K(NaMg2)Si4O10F2

Composition:

Molecular Weight = 421.03 gm

Potassium 9.29 % K 11.19 % K₂O

Sodium 5.46 % Na 7.36 % Na₂O

Magnesium 11.55 % Mg 19.15 % MgO

Silicon 26.68 % Si 57.08 % SiO₂

Oxygen 38.00 % O

Fluorine 9.02 % F 9.02 % F

- % F -3.80 % -O=F₂

______ ______

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 Crystallography

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 - PrismaticH-M Symbol (2/m) Space Group: C 2/m

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

By Intensity(I/I_o): 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)

Crystal Structure:

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Pekov I V , Chukanov N V , Ferraris G , Ivaldi G , Pushcharovsky D Y , Zadov A E , European Journal of Mineralogy , 15 (2003) p.447-454, Shirokshinite, K(NaMg2)Si4O10F2, a new mica with octahedral Na from Khidiny massif,, Kola Peninsula: descriptive data and structural disorder, Locality: Khidiny massif, Kola Peninsula, Russia

Physical Properties of Shirokshinite

Cleavage:

[001] Perfect

Color:

Colorless, Pale gray.

Diaphaniety:

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

Optical Properties of Shirokshinite

Gladstone-Dale:

CI calc= 0.055 (Good) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1863,KC= 0.1972

Optical Data:

Biaxial (-), a=1.526, b=1.553, g=1.553, bire=0.0270

Calculated Properties of Shirokshinite

Electron Density:

r_electron=2.89 gm/cc
note: r_{Shirokshinite}=2.92 gm/cc.

Fermion Index

Fermion Index = 0.02419
Boson Index = 0.97581

Photoelectric:

PE_{Shirokshinite}= 2.34 barns/electron
U=PE_{Shirokshinite} x r_electron= 6.76 barns/cc.

Radioactivity:

GRapi = 132.40 (Gamma Ray American Petroleum Institute Units)

Estimated Radioactivity from Shirokshinite - barely detectable

Shirokshinite Classification

Dana Class:

71.2.2a.12 (71)Phyllosilicate Sheets of Six-Membered Rings

(71.2)with 2:1 Layers

(71.2.2a)Mica Group (Muscovite subgroup)

71.2.2a.1 Muscovite KAl2(Si3Al)O10(OH,F)2 C 2/m 2/m

71.2.2a.2 Paragonite NaAl2(Si3Al)O10(OH)2 C 2/c,Cc Mono

71.2.2a.3 Chernykhite (Ba,Na)V,Al)2(Si,Al)4O10(OH)2 C 2/c 2/m

71.2.2a.4 Roscoelite K(V,Al,Mg)2AlSi3O10(OH)2 C 2/m 2/m

71.2.2a.5 Glauconite (K,Na)(Fe,Al,Mg)2(Si,Al)4O10(OH)2 C 2/m 2/m

71.2.2a.6 Celadonite K(Mg,Fe)(Fe,Al)[Si4O10](OH)2 C 2/m 2/m

71.2.2a.6b Ferroceladonite! K2FeFeSi8O20(OH)4 C 2/m 2/m

71.2.2a.6c Ferro-aluminoceladonite! K2Fe2Al2Si8O20(OH)4 C 2/m 2/m

71.2.2a.6d Aluminoceladonite! KAl(Mg,Fe)[]Si4O10(OH)2 2/m

71.2.2a.6e Chromceladonite! KCrMg(Si4O10)(OH)2 C 2 2

71.2.2a.7 Tobelite (NH4,K)Al2(Si3Al)O10(OH)2 C 2/m 2/m

71.2.2a.8 Nanpingite Cs(Al,Mg,Fe,Li)2(Si3Al)O10(OH,F)2 C 2/c 2/m

71.2.2a.9 Boromuscovite KAl2(Si3B)O10(OH,F)2 C 2/m 2/m

71.2.2a.10 Montdorite (K,Na)(Fe,Mn,Mg)2.5[Si4O10](F,OH)2 C 2/c 2/m

71.2.2a.11 Chromphyllite! (K,Ba)(Cr,Al)2[AlSi3O10](OH,F)2 C 2c 2/m

71.2.2a.12 Shirokshinite ! K(NaMg2)Si4O10F2 C 2/m 2/m

Strunz Class:

VIII/H.11-35 VIII - Silicates

VIII/H - Phyllosilicates (layered) Mica like layered silicates with [Si4O10]4- and related groups

VIII/H.11 - Mica group, Biotite series

VIII/H.11-00* Zinnwaldite KLiFeAl(AlSi3)O10(F,OH)2 C 2/m 2/m

VIII/H.11-10 Polylithionite KLi2AlSi4O10(F,OH)2 C 2/m 2/m

VIII/H.11-20 Tainiolite KLiMg2Si4O10F2 C 2/m 2/m

VIII/H.11-30 Norrishite K(Mn2Li)Si4O10(O)2 C 2/m 2/m

VIII/H.11-35 Shirokshinite K(NaMg2)Si4O10F2 C 2/m 2/m

VIII/H.11-40 Montdorite (K,Na)(Fe,Mn,Mg)2.5[Si4O10](F,OH)2 C 2/c 2/m

VIII/H.11-50 Trilithionite! KLi1.5Al1.5AlSi3O10F2 C 2/m 2/m

VIII/H.11-60 Masutomilite K(Li,Al,Mn)3[(Si,Al)4O10](F,OH)2 C 2/m 2/m

VIII/H.11-70 Aspidolite NaMg3AlSi3O10(OH)2 C 2/m 2/m

VIII/H.11-80 Phlogopite KMg3(Si3Al)O10(F,OH)2 C 2/m 2/m

VIII/H.11-90 Tetra-ferriphlogopite! KMg3FeSi3O10(OH)2 2/m

VIII/H.11-100 Hendricksite K(Zn,Mg,Mn)3Si3AlO10(OH)2 C 2/m 2/m

VIII/H.11-102 Shirozulite! KMn3(AlSi3)O10(OH,F)2 C 2/m 2/m

VIII/H.11-105 Fluorannite! KFe3AlSi3O10F2 C 2/m 2/m

VIII/H.11-110 Annite KFe3AlSi3O10(OH,F)2 C 2/m 2/m

VIII/H.11-120 Tetra-ferri-annite K(Fe,Mg)3(Fe,Al)Si3O10(OH)2 C 2/m 2/m

VIII/H.11-130 Ephesite NaLiAl2(Al2Si2)O10(OH)2 C 2/c 2/m

VIII/H.11-140 Preiswerkite NaMg2Al3Si2O10(OH)2 C 2/m 2/m

VIII/H.11-150 Eastonite! KMg2Al[Al2Si2O10](OH)2 2/m

VIII/H.11-160 Siderophyllite KFe2Al(Al2Si2)O10(F,OH)2 C 2/m 2/m

Other Shirokshinite Information

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 -Google Images 4 -Google Scholar 5 -MinDAT 6 -MinMax(Deutsch) 7 -MinMax(English) 8 -Mineralienatlas (Deutsch) 9 -QUT Mineral Atlas

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Shirokshinite

K(NaMg2)Si4O10F2
Dana No: 71.2.2a.12 Strunz No: VIII/H.11-35
Locality:

Notes: