Richterite Mineral Data

General Richterite Information

Chemical Formula:

Na(CaNa)(Mg,Fe++)5[Si8O22](OH)2

Composition:

Molecular Weight = 881.35 gm

Sodium 5.22 % Na 7.03 % Na₂O

Calcium 4.55 % Ca 6.36 % CaO

Magnesium 8.27 % Mg 13.72 % MgO

Iron 12.67 % Fe 16.30 % FeO

Silicon 25.49 % Si 54.54 % SiO₂

Hydrogen 0.23 % H 2.04 % H₂O

Oxygen 43.57 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

Na₂CaMg₃Fe²⁺₂(Si₈O₂₂)(OH)₂

IMA Status:

Valid Species (Pre-IMA) 1865

Locality:

Link to MinDat.org Location Data.

Name Origin:

Named as per current IMA amphibole nomenclature (Burke and Leake 2004; Can. Mineral., 42, 1881-1883).

Name Pronunciation:

Richterite + Pronunciation

Synonym:

ICSD 72080

PDF 25-808

Richterite Image

Images:

Calzirtite Augite Richterite

Comments: Gray irregular grain of calzirtite (see arrow) in fibrous augite with dark red richterite.
Location: Jacupiranga Mine, Cajati, Sao Paulo, Brazil. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Images:

Richterite

Comments: Richterite crystal in tan calcite.
Location: Bancroft, Ontario, Canada. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Richterite Crystallography

Axial Ratios:

a:b:c =0.5446:1:0.2842

Cell Dimensions:

a = 10.03, b = 18.415, c = 5.234, Z = 2; beta = 104.97° V = 933.92 Den(Calc)= 3.13

Crystal System:

Monoclinic - Prismatic H-M Symbol (2/m) Space Group: C 2/m

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

By Intensity(I/I_o): 3.186(1), 3.301(0.75), 8.56(0.75),

Physical Properties of Richterite

Cleavage:

{110} Perfect, {100} Perfect

Color:

Blue, Brown, Brown red, Gray violet, Yellow.

Density:

3.09

Diaphaneity:

Transparent to translucent

Fracture:

Brittle - Uneven - Very brittle fracture producing uneven fragments.

Habit:

Tabular - Form dimensions are thin in one direction.

Hardness:

6 - Orthoclase

Luster:

Vitreous (Glassy)

Streak:

white

Optical Properties of Richterite

Gladstone-Dale:

CI meas= 0.012 (Superior) - where the CI = (1-KPDmeas/KC)
CI calc= 0.024 (Excellent) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2002,KPDmeas= 0.2028,KC= 0.2052
Ncalc = 1.63 - 1.64

Optical Data:

Biaxial (-), a=1.615, b=1.629, g=1.636, bire=0.0210, 2V(Calc)=70, 2V(Meas)=68.

Calculated Properties of Richterite

Electron Density:

Bulk Density (Electron Density)=3.06 gm/cc
note: Specific Gravity of Richterite =3.09 gm/cc.

Fermion Index:

Fermion Index = 0.02
Boson Index = 0.98

Photoelectric:

PE_Richterite= 5.54 barns/electron
U=PE_Richterite x rElectron Density= 16.93 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Richterite is Not Radioactive

Richterite Classification

Dana Class:

66.01.03b.09 (66)Inosilicate Double-Width Unbranched Chains, W=2

(66.01)with P=2 amphibole configuration

(66.01.03b)Group 3, the sodic-calcic amphiboles

66.01.03b.01 Winchite [](CaNa)Mg4(Al,Fe3)Si8O22(OH)2 C 2/m 2/m

66.01.03b.01a Parvowinchite Na(NaMn)(Mg4Fe)Si8O22(OH)2 C 2/m 2/m

66.01.03b.02 Ferrowinchite [](CaNa)Fe4(Al,Fe)Si8O22(OH)2 C 2/m 2/m

66.01.03b.03 Ferriwinchite ([],Na)(Na,Ca)2(Mg,Fe)4Fe[Si8O22](OH)2 C 2/m 2/m

66.01.03b.04 Ferroferriwinchite* CaNa(Fe,Mg)4Fe[Si8O22](OH)2 C 2/m 2/m

66.01.03b.05 Barroisite [](CaNa)Mg3AlFeSi7AlO22(OH)2 C 2/m 2/m

66.01.03b.05a Aluminobarroisite! []CaNaMg3Al2(Si7Al)O22(OH)2 C 2/m 2/m

66.01.03b.06 Ferrobarroisite [](CaNa)Fe3AlFeSi7AlO22(OH)2 C 2/m 2/m

66.01.03b.06a Aluminoferrobarroisite! []CaNa(Fe2)3Al2(Si7Al)O22(OH)2 C 2/m 2/m

66.01.03b.07 Ferribarroisite CaNa(Fe,Mg)3Fe2[AlSi7O22](OH)2 C 2/m 2/m

66.01.03b.08 Ferroferribarroisite* CaNa(Fe,Mg)3Fe2[AlSi7O22](OH)2 C 2/m 2/m

66.01.03b.08a Ferri-ferrobarroisite! []CaNa(Fe)3(Fe)2(Si7Al)O22(OH)2 C 2/m 2/m

66.01.03b.09 Richterite Na(CaNa)(Mg,Fe)5[Si8O22](OH)2 C 2/m 2/m

66.01.03b.09a Fluororichterite! Na(CaNa)Mg5[Si8O22]F2 C 2/m 2/m

66.01.03b.09b Potassic-fluororichterite! (K,Na)(CaNa)Mg5[Si8O22]F2 C 2/m 2/m

66.01.03b.09c Potassicrichterite! (K,Na)(CaNa)2Mg5[Si8O22](OH,F)2 C 2/m 2/m

66.01.03b.10 Ferrorichterite Na(CaNa)Fe5[Si8O22](OH)2 C 2/m 2/m

66.01.03b.11 Magnesiokatophorite Na(CaNa)Mg4AlSi7AlO22(OH)2 C 2/m 2/m

66.01.03b.12 Katophorite Na(CaNa)Fe4(Al,Fe)Si7AlO22(OH)2 C 2/m 2/m

66.01.03b.13 Magnesioferrikatophorite Na2Ca(Mg,Fe)4FeSi7AlO22(OH)2 C 2/m 2/m

66.01.03b.14 Ferrikatophorite Na2Ca(Fe,Mg)4Fe(Si7Al)O22(OH)2 C 2/m 2/m

66.01.03b.15 Magnesiotaramite Na(CaNa)Mg3ALFe[Si6Al2O22](OH)2 C 2/m 2/m

66.01.03b.15a Aluminotaramite! Na(CaNa)(Fe3Al2)(Si6Al2)O22(OH)2 C 2/m 2/m

66.01.03b.15b Alumino-magnesiotaramite! Na(CaNa)(Mg3Al2)(Si6Al2)O22(OH)2 C 2/m 2/m

66.01.03b.15c Fluoro-alumino-magnesiotaramite! Na(CaNa)(Mg3Al2)(Si6Al2)O22F2 C 2/m 2/m

66.01.03b.16 Taramite Na(CaNa)Fe3AlFe[Si6Al2O22](OH)2 C 2/m 2/m

66.01.03b.17 Ferri-magnesiotaramite! NaCaNaMg3Fe2[Si6Al2O22](OH)2 C 2/m 2/m

66.01.03b.18 Ferritaramite Na(CaNa)(Fe,Mg)3Fe2[Si6Al2O22](OH)2 C 2/m 2/m

66.01.03b.19 Fluoropargasite! NaCa2(Mg3FeAl)5(Si6Al2O22)F2 C 2/m 2/m

66.01.03b.20 Parvo-mangano-edenite! Na(CaMn)2Mg5(Si7Al)O22(OH)2 C 2/m 2/m

66.01.03b.21 Parvo-manganotremolite! [](CaMn)2Mg5(Si7Al)O22(OH)2 C 2/m 2/m

Strunz Class:

09.DE.20 09 - SILICATES (Germanates)

09.D - Inosilicates* Structural terminology according to Liebau (1985)

09.DE -Inosilicates with 2-periodic double chains, Si4O11; amphibole family

09.DE.20 Winchite [](CaNa)Mg4(Al,Fe3)Si8O22(OH)2 C 2/m 2/m

09.DE.20 Aluminobarroisite! []CaNaMg3Al2(Si7Al)O22(OH)2 C 2/m 2/m

09.DE.20 Ferriwinchite ([],Na)(Na,Ca)2(Mg,Fe)4Fe[Si8O22](OH)2 C 2/m 2/m

09.DE.20 Ferroferriwinchite* CaNa(Fe,Mg)4Fe[Si8O22](OH)2 C 2/m 2/m

09.DE.20 Aluminoferrobarroisite! []CaNa(Fe2)3Al2(Si7Al)O22(OH)2 C 2/m 2/m

09.DE.20 Ferri-ferrobarroisite! []CaNa(Fe)3(Fe)2(Si7Al)O22(OH)2 C 2/m 2/m

09.DE.20 Ferribarroisite CaNa(Fe,Mg)3Fe2[AlSi7O22](OH)2 C 2/m 2/m

09.DE.20 Barroisite [](CaNa)Mg3AlFeSi7AlO22(OH)2 C 2/m 2/m

09.DE.20 Fluororichterite! Na(CaNa)Mg5[Si8O22]F2 C 2/m 2/m

09.DE.20 Ferrobarroisite [](CaNa)Fe3AlFeSi7AlO22(OH)2 C 2/m 2/m

09.DE.20 Magnesiotaramite Na(CaNa)Mg3ALFe[Si6Al2O22](OH)2 C 2/m 2/m

09.DE.20 Ferrikatophorite Na2Ca(Fe,Mg)4Fe(Si7Al)O22(OH)2 C 2/m 2/m

09.DE.20 Ferrorichterite Na(CaNa)Fe5[Si8O22](OH)2 C 2/m 2/m

09.DE.20 Ferrowinchite [](CaNa)Fe4(Al,Fe)Si8O22(OH)2 C 2/m 2/m

09.DE.20 Ferroferribarroisite* CaNa(Fe,Mg)3Fe2[AlSi7O22](OH)2 C 2/m 2/m

09.DE.20 Ferritaramite Na(CaNa)(Fe,Mg)3Fe2[Si6Al2O22](OH)2 C 2/m 2/m

09.DE.20 Ferri-magnesiotaramite! NaCaNaMg3Fe2[Si6Al2O22](OH)2 C 2/m 2/m

09.DE.20 Magnesioferrikatophorite Na2Ca(Mg,Fe)4FeSi7AlO22(OH)2 C 2/m 2/m

09.DE.20 Katophorite Na(CaNa)Fe4(Al,Fe)Si7AlO22(OH)2 C 2/m 2/m

09.DE.20 Parvowinchite Na(NaMn)(Mg4Fe)Si8O22(OH)2 C 2/m 2/m

09.DE.20 Potassic-fluororichterite! (K,Na)(CaNa)Mg5[Si8O22]F2 C 2/m 2/m

09.DE.20 Richterite Na(CaNa)(Mg,Fe)5[Si8O22](OH)2 C 2/m 2/m

09.DE.20 Taramite Na(CaNa)Fe3AlFe[Si6Al2O22](OH)2 C 2/m 2/m

09.DE.20 Magnesiokatophorite Na(CaNa)Mg4AlSi7AlO22(OH)2 C 2/m 2/m

09.DE.20 Potassicrichterite! (K,Na)(CaNa)2Mg5[Si8O22](OH,F)2 C 2/m 2/m

09.DE.20 Fluoro-alumino-magnesiotaramite! Na(CaNa)(Mg3Al2)(Si6Al2)O22F2 C 2/m 2/m

09.DE.20 Aluminotaramite! Na(CaNa)(Fe3Al2)(Si6Al2)O22(OH)2 C 2/m 2/m

09.DE.20 Alumino-magnesiotaramite! Na(CaNa)(Mg3Al2)(Si6Al2)O22(OH)2 C 2/m 2/m

Other Richterite Information

References:

PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Ford32)

See Also:

Links to other databases for Richterite :
1 - Alkali-Nuts(English)
2 - Alkali-Nuts(Francais)
3 - Am. Min. Crystal Structure Database
4 - Amethyst Galleries' Mineral Gallery
5 - Athena
6 - EUROmin Project
7 - Ecole des Mines de Paris
8 - Franklin Minerals(Dunn)
9 - GeoScienceWorld
10 - Google Images
11 - Google Scholar
12 - Handbook of Mineralogy (MinSocAm)
13 - Handbook of Mineralogy (UofA)
14 - MinDAT
15 - Mineralienatlas (Deutsch)
16 - Online Mineral Museum
17 - QUT Mineral Atlas
18 - Ruff.Info
19 - Scandinavian mineral gallery
20 - WWW-MINCRYST

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Richterite

Na(CaNa)(Mg,Fe++)5[Si8O22](OH)2
Dana No: 66.01.03b.09 Strunz No: 09.DE.20
Locality:

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