Norrishite Mineral Data

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 % K₂O

Lithium 1.51 % Li 3.25 % Li₂O

Manganese 23.87 % Mn 34.30 % Mn₂O₃

Silicon 24.41 % Si 52.22 % SiO₂

Oxygen 41.71 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

KMn³⁺₂LiSi₄O₁₂

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.

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

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

By Intensity(I/I_o): 10.01(1), 3.329(0.8), 3.16(0.7),

Crystal Structure:

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Tyrna P L , Guggenheim S , American Mineralogist , 76 (1991) p.266-271, The crystal structure of norrishite, KLiMn2Si4O12: An oxygen-rich mica

Physical Properties of Norrishite

Cleavage:

[001] Perfect

Color:

Brownish black, Black.

Density:

3.264

Diaphaniety:

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

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:

r_electron=3.17 gm/cc
note: r_Norrishite=3.26 gm/cc.

Fermion Index

Fermion Index = 0.01274
Boson Index = 0.98726

Photoelectric:

PE_Norrishite= 7.89 barns/electron
U=PE_Norrishite x r_electron= 25.05 barns/cc.

Radioactivity:

GRapi = 119.31 (Gamma Ray American Petroleum Institute Units)

Estimated Radioactivity from Norrishite - barely detectable

Norrishite Classification

Dana Class:

71.2.2b.11 (71)Phyllosilicate Sheets of Six-Membered Rings

(71.2)with 2:1 Layers

(71.2.2b)Mica Group (Biotite subgroup)

71.2.2b.1 Phlogopite KMg3(Si3Al)O10(F,OH)2 C 2/m 2/m

71.2.2b.1a Tetra-ferriphlogopite! KMg3FeSi3O10(OH)2 2/m

71.2.2b.1b Shirozulite! KMn3(AlSi3)O10(OH,F)2 C 2/m 2/m

71.2.2b.2 Biotite* K(Mg,Fe)3[AlSi3O10(OH,F)2 C 2/m 2/m

71.2.2b.3 Annite KFe3AlSi3O10(OH,F)2 C 2/m 2/m

71.2.2b.3a Fluorannite! KFe3AlSi3O10F2 C 2/m 2/m

71.2.2b.4 Tetra-ferri-annite K(Fe,Mg)3(Fe,Al)Si3O10(OH)2 C 2/m 2/m

71.2.2b.5 Siderophyllite KFe2Al(Al2Si2)O10(F,OH)2 C 2/m 2/m

71.2.2b.5a Eastonite! KMg2Al[Al2Si2O10](OH)2 2/m

71.2.2b.6 Hendricksite K(Zn,Mg,Mn)3Si3AlO10(OH)2 C 2/m 2/m

71.2.2b.7 Lepidolite K(Li,Al)3(Si,Al)4O10(F,OH)2 C 2/m,Cm Mono

71.2.2b.8 Polylithionite KLi2AlSi4O10(F,OH)2 C 2/m 2/m

71.2.2b.8a Trilithionite! KLi1.5Al1.5AlSi3O10F2 C 2/m 2/m

71.2.2b.8b Sokolovaite! CsLi2AlSi4O10F2 C 2/m, C 2 or Cm Mono

71.2.2b.9 Tainiolite KLiMg2Si4O10F2 C 2/m 2/m

71.2.2b.10 Zinnwaldite KLiFeAl(AlSi3)O10(F,OH)2 C 2/m 2/m

71.2.2b.11 Norrishite K(Mn2Li)Si4O10(O)2 C 2/m 2/m

71.2.2b.12 Masutomilite K(Li,Al,Mn)3[(Si,Al)4O10](F,OH)2 C 2/m 2/m

71.2.2b.13 Aspidolite NaMg3AlSi3O10(OH)2 C 2/m 2/m

71.2.2b.14 Wonesite (Na,K).5(Mg,Fe,Al)3(Si,Al)4O10(OH,F)2 C 2/m 2/m

71.2.2b.15 Preiswerkite NaMg2Al3Si2O10(OH)2 C 2/m 2/m

71.2.2b.16 Ephesite NaLiAl2(Al2Si2)O10(OH)2 C 2/c 2/m

71.2.2b.17 IMA2004-049! NaMg3(AlSi3)O10(OH)2 C 2/m 2/m

Strunz Class:

VIII/H.11-30 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 Norrishite Information

References:

NAME( AntBidBlaNic2) PHYS. PROP.(AmMin, Vol.87, p189) OPTIC PROP.(Am.Min.,Vol.74,p1360-1367,1989)

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Norrishite

K(Mn+++2Li)Si4O10(O)2
Dana No: 71.2.2b.11 Strunz No: VIII/H.11-30
Locality:

Notes: