Truscottite Mineral Data

General Truscottite Information

Chemical Formula:

(Ca,Mn++)14Si24O58(OH)8•2(H2O)

Composition:

Molecular Weight = 2,364.92 gm

Calcium 20.34 % Ca 28.45 % CaO

Manganese 4.65 % Mn 6.00 % MnO

Silicon 28.50 % Si 60.98 % SiO₂

Hydrogen 0.51 % H 4.57 % H₂O

Oxygen 46.00 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

Ca₁₂Mn²⁺₂Si₂₄O₅₈(OH)₈•2(H₂O)

Environment:

Hydrothermal deposits.

IMA Status:

Valid Species (Pre-IMA) 1914

Locality:

Lelong Donok gold mine, Benkeelen, Sumatra, Indonesia. Link to MinDat.org Location Data.

Name Origin:

Named for Samuel John Truscott (1970-1950), English mining geologist.

Name Pronunciation:

Truscottite + Pronunciation

Truscottite Image

Images:

Truscottite

Comments: Whitish pearly scaly massive truscottite.
Location: Lebong Donok Mine, Benkeelen, Sumatra Island, Indonesia. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Truscottite Crystallography

Axial Ratios:

a:c = 1:1.93566

Cell Dimensions:

a = 9.731, c = 18.836, Z = 1; V = 1,544.67 Den(Calc)= 2.54

Crystal System:

Trigonal Space Group: p3 or p3

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

By Intensity(I/I_o): 3.141(1), 2.84(0.8), 4.21(0.7),

Physical Properties of Truscottite

Cleavage:

{0001} Perfect

Color:

White.

Density:

2.35

Diaphaneity:

Transparent to translucent

Habit:

Aggregates - Made of numerous individual crystals or clusters.

Habit:

Micaceous - Platy texture with "flexible" plates.

Habit:

Spherical - Spherical, rounded aggregates.

Luster:

Pearly

Streak:

white

Optical Properties of Truscottite

Gladstone-Dale:

CI meas= -0.076 (Fair) - where the CI = (1-KPDmeas/KC)
CI calc= 0.004 (Superior) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.213,KPDmeas= 0.2302,KC= 0.2139
Ncalc = 1.5 - 1.54

Optical Data:

Uniaxial (-), e=1.552, w=1.53, bire=0.0220.

Calculated Properties of Truscottite

Electron Density:

Bulk Density (Electron Density)=2.54 gm/cc
note: Specific Gravity of Truscottite =2.54 gm/cc.

Fermion Index:

Fermion Index = 0.01
Boson Index = 0.99

Photoelectric:

PE_Truscottite= 4.75 barns/electron
U=PE_Truscottite x rElectron Density= 12.05 barns/cc.

Radioactivity:

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

Truscottite Classification

Dana Class:

73.02.02a.02 (73)Phyllosilicate Condensed Tetrahedral Sheets

(73.02)with double and single layers

(73.02.02a)Reyerite group (Reyerite Subgroup)

73.02.02a.01 Reyerite (Na,K)4Ca14Si22Al2O58(OH)8•6(H2O) P 3 3

73.02.02a.02 Truscottite (Ca,Mn)14Si24O58(OH)8•2(H2O) p3 or p3 Trig

Strunz Class:

09.EE.35 09 - SILICATES (Germanates)

09.E - Phyllosilicates

09.EE -Single tetrahedral nets of 6-membered rings

09.EE.35 Reyerite (Na,K)4Ca14Si22Al2O58(OH)8•6(H2O) P 3 3

09.EE.35 Truscottite (Ca,Mn)14Si24O58(OH)8•2(H2O) p3 or p3 Trig

Other Truscottite Information

References:

NAME( Ford32) PHYS. PROP.(Dana8) OPTIC PROP.(Dana8)

See Also:

Links to other databases for Truscottite :
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

Search for Truscottite using:

[AOL] [Bing] [Dog Pile] [GeoScienceWorld] [HotBot] [Ixquick] [Lycos] [MAMMA] [Scirus] [Teoma] [WebCrawler] [Wikipedia] [YAHOO]

Visit our Advertisers for Truscottite :

Ask about Truscottite here :
Ask-A-Mineralogist from the Mineralogical Society of America
Mindat.org's Discussion Groups
Original Rockhounds Discussion Group
Rockhounds Discussion Group on Yahoo Groups
Mineral Discussion Forum from Fabre Minerals - also available in Español

Print or Cut-and-Paste your Truscottite Specimen Label here :

Truscottite

(Ca,Mn++)14Si24O58(OH)8•2(H2O)
Dana No: 73.02.02a.02 Strunz No: 09.EE.35
Locality:

Notes:

Dakota Matrix
Excalibur Minerals
Exceptional Minerals
Hudson Insitute
John Betts Fine Minerals
Mc Dougall Minerals
Mineral News
Rock and Mineral Shows
Weinrich Minerals, Inc.