Norrishite Mineral Data
General Norrishite Information
Chemical Formula:
K(Mn+++2Li)Si4O10(O)2
Composition:
Molecular Weight = 460.25 gm
Potassium 8.50 % K 10.23 % K2 O
Lithium 1.51 % Li 3.25 % Li2 O
Manganese 23.87 % Mn 34.30 % Mn2 O3
Silicon 24.41 % Si 52.22 % SiO2
Oxygen 41.71 % O
______ ______
100.00 % 100.00 % = TOTAL OXIDE
Empirical Formula:
KMn3+ 2 LiSi4 O12
Environment:
Major to minor component of manganiferous schists, formed through metamorphism of a stratiform manganese deposit. Resembles biotite.
IMA Status:
Approved IMA 1989
Locality:
Hoskins mine, three km west of Grenfell, New South Wales, Australia. Link to MinDat.org Location Data.
Name Origin:
Named for Keith Norrish of the Division of Soils, Commonwealth Scientific and Industrial Research Organization, Australia.
Name Pronunciation:
Norrishite + Pronunciation
Norrishite Image
Images:
Norrishite
Comments: Thin section photomicrograph showing norrishite (Nrs) associated with kornite (Krn), sugilite (Sgl), and Mn-rich pectolite (Pct) (AmMin 88:190).
Location: Silicate-rich sample from the Wessels mine, Kalahari manganese field, South Africa.
Scale: Picture Size 2.4 mm.
© American Mineralogist
Norrishite Crystallography
Axial Ratios:
a:b:c =0.5941:1:1.1275
Cell Dimensions:
a = 5.29, b = 8.904, c = 10.04, Z = 2; beta = 98.15° V = 468.13 Den(Calc)= 3.26
Crystal System:
Monoclinic - Prismatic H-M Symbol (2/m) Space Group: C 2/m
X Ray Diffraction:
By Intensity(I/Io ): 10.01(1), 3.329(0.8), 3.16(0.7),
Physical Properties of Norrishite
Cleavage:
{001} Perfect
Color:
Brownish black, Black.
Density:
3.264
Diaphaneity:
Translucent
Habit:
Foliated - Two dimensional platy forms.
Habit:
Massive - Uniformly indistinguishable crystals forming large masses.
Hardness:
2.5 - Finger Nail
Luster:
Sub Metallic
Streak:
light brown
Optical Properties of Norrishite
Gladstone-Dale:
CI meas = 0.11 (Poor) - where the CI = (1-KPDmeas /KC ) CI calc = 0.109 (Poor) - where the CI = (1-KPDcalc /KC )
KPDcalc = 0.2155,KPDmeas = 0.2153,KC = 0.2419 Ncalc = 1.79
Optical Data:
Biaxial (+), a=1.636, b=1.687, g=1.785, bire=0.1490, 2V(Calc)=76, 2V(Meas)=74-75.
Pleochroism (x):
bright lemon yellow.
Pleochroism (y):
lime green.
Pleochroism (z):
brownish yellow.
Calculated Properties of Norrishite
Electron Density:
Bulk Density (Electron Density)=3.17 gm/cc note: Specific Gravity of Norrishite =3.26 gm/cc.
Fermion Index:
Fermion Index = 0.01 Boson Index = 0.99
Photoelectric:
PENorrishite = 7.89 barns/electronU=PENorrishite x r electron = 25.05 barns/cc.
Radioactivity:
GRapi = 119.31 (Gamma Ray American Petroleum Institute Units)
Concentration of Norrishite per GRapi unit = 0.84 (%)
Estimated Radioactivity from Norrishite - barely detectable
Norrishite Classification
Dana Class:
71.02.02b.11 (71) Phyllosilicate Sheets of Six-Membered Rings
(71.02) with 2:1 Layers
(71.02.02b) Mica Group (Biotite subgroup)
71.02.02b.01 Phlogopite KMg3(Si3Al)O10(F,OH)2 C 2/m 2/m
71.02.02b.01a Tetraferriphlogopite ! KMg3FeSi3O10(OH)2 2/m
71.02.02b.01b Shirozulite ! KMn3(AlSi3)O10(OH,F)2 C 2/m 2/m
71.02.02b.01c Fluorophlogopite ! KMg3(AlSi3)O10F2 C 2/m 2/m
71.02.02b.02 Biotite * K(Mg,Fe)3[AlSi3O10(OH,F)2 C 2/m 2/m
71.02.02b.03 Annite KFe3AlSi3O10(OH,F)2 C 2/m 2/m
71.02.02b.03a Fluorannite ! KFe3AlSi3O10F2 C 2/m 2/m
71.02.02b.04 Tetraferriannite K(Fe,Mg)3(Fe,Al)Si3O10(OH)2 C 2/m 2/m
71.02.02b.05 Siderophyllite KFe2Al(Al2Si2)O10(F,OH)2 C 2/m 2/m
71.02.02b.05a Eastonite ! KMg2Al[Al2Si2O10](OH)2 2/m
71.02.02b.06 Hendricksite K(Zn,Mg,Mn)3Si3AlO10(OH)2 C 2/m 2/m
71.02.02b.07 Lepidolite K(Li,Al)3(Si,Al)4O10(F,OH)2 C 2/m,Cm Mono
71.02.02b.08 Polylithionite KLi2AlSi4O10(F,OH)2 C 2/m 2/m
71.02.02b.08a Trilithionite ! KLi1.5Al1.5AlSi3O10F2 C 2/m 2/m
71.02.02b.08b Sokolovaite ! CsLi2AlSi4O10F2 C 2/m, C 2 or Cm Mono
71.02.02b.09 Tainiolite KLiMg2Si4O10F2 C 2/m 2/m
71.02.02b.10 Zinnwaldite KLiFeAl(AlSi3)O10(F,OH)2 C 2/m 2/m
71.02.02b.11 Norrishite K(Mn2Li)Si4O10(O)2 C 2/m 2/m
71.02.02b.12 Masutomilite K(Li,Al,Mn)3[(Si,Al)4O10](F,OH)2 C 2/m 2/m
71.02.02b.13 Aspidolite NaMg3AlSi3O10(OH)2 C 2/m 2/m
71.02.02b.14 Wonesite (Na,K).5(Mg,Fe,Al)3(Si,Al)4O10(OH,F)2 C 2/m 2/m
71.02.02b.15 Preiswerkite NaMg2Al3Si2O10(OH)2 C 2/m 2/m
71.02.02b.16 Ephesite NaLiAl2(Al2Si2)O10(OH)2 C 2/c 2/m
71.02.02b.18 Suhailite ! (NH4)Fe3(Si3Al)O10(OH)2 C 2/m? 2/m
Strunz Class:
09.EC.20 09 - SILICATES (Germanates)
09.E - Phyllosilicates
09.EC -Phyllosilicates with mica sheets, composed of tetrahedral and octahedral nets
09.EC.20 Annite KFe3AlSi3O10(OH,F)2 C 2/m 2/m
09.EC.20 Biotite * K(Mg,Fe)3[AlSi3O10(OH,F)2 C 2/m 2/m
09.EC.20 Hendricksite K(Zn,Mg,Mn)3Si3AlO10(OH)2 C 2/m 2/m
09.EC.20 Ephesite NaLiAl2(Al2Si2)O10(OH)2 C 2/c 2/m
09.EC.20 Aspidolite NaMg3AlSi3O10(OH)2 C 2/m 2/m
09.EC.20 Lepidolite K(Li,Al)3(Si,Al)4O10(F,OH)2 C 2/m,Cm Mono
09.EC.20 Preiswerkite NaMg2Al3Si2O10(OH)2 C 2/m 2/m
09.EC.20 Masutomilite K(Li,Al,Mn)3[(Si,Al)4O10](F,OH)2 C 2/m 2/m
09.EC.20 Wonesite (Na,K).5(Mg,Fe,Al)3(Si,Al)4O10(OH,F)2 C 2/m 2/m
09.EC.20 Polylithionite KLi2AlSi4O10(F,OH)2 C 2/m 2/m
09.EC.20 Phlogopite KMg3(Si3Al)O10(F,OH)2 C 2/m 2/m
09.EC.20 Norrishite K(Mn2Li)Si4O10(O)2 C 2/m 2/m
09.EC.20 Siderophyllite KFe2Al(Al2Si2)O10(F,OH)2 C 2/m 2/m
09.EC.20 Fluorannite ! KFe3AlSi3O10F2 C 2/m 2/m
09.EC.20 Shirokshinite ! K(NaMg2)Si4O10F2 C 2/m 2/m
09.EC.20 Zinnwaldite KLiFeAl(AlSi3)O10(F,OH)2 C 2/m 2/m
09.EC.20 Eastonite ! KMg2Al[Al2Si2O10](OH)2 2/m
09.EC.20 Tetraferriannite K(Fe,Mg)3(Fe,Al)Si3O10(OH)2 C 2/m 2/m
09.EC.20 Tetraferriphlogopite ! KMg3FeSi3O10(OH)2 2/m
09.EC.20 Trilithionite ! KLi1.5Al1.5AlSi3O10F2 C 2/m 2/m
09.EC.20 Sokolovaite ! CsLi2AlSi4O10F2 C 2/m, C 2 or Cm Mono
09.EC.20 Shirozulite ! KMn3(AlSi3)O10(OH,F)2 C 2/m 2/m
09.EC.20 Suhailite ! (NH4)Fe3(Si3Al)O10(OH)2 C 2/m? 2/m
09.EC.20 Fluorophlogopite ! KMg3(AlSi3)O10F2 C 2/m 2/m
Other Norrishite Information
References:
NAME( AntBidBlaNic2) PHYS. PROP.(AmMin, Vol.87, p189) OPTIC PROP.(Am.Min.,Vol.74,p1360-1367,1989)
See Also:
Links to other databases for Norrishite :
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 - Handbook of Mineralogy (MinSocAm)
9 - Handbook of Mineralogy (UofA)
10 - MinDAT
11 - Mineralienatlas (Deutsch)
12 - Online Mineral Museum
13 - QUT Mineral Atlas
14 - Ruff.Info
15 - WWW-MINCRYST
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Norrishite
K(Mn+++2Li)Si4O10(O)2
Dana No: 71.02.02b.11 Strunz No: 09.EC.20
Locality:
Notes:
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