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 % H2 O
Oxygen 46.00 % O
______ ______
100.00 % 100.00 % = TOTAL OXIDE
Empirical Formula:
Ca12 Mn2+ 2 Si24 O58 (OH)8 •2(H2 O)
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 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
X Ray Diffraction:
By Intensity(I/Io ): 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:
PETruscottite = 4.75 barns/electronU=PETruscottite x r Electron 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
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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:
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