Data mineral Lebong Donok gold mine, Benkeelen, Sumatra, Indonesia.

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.
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:	TrigonalSpace 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
Diaphaniety:	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
Optical Data:	Uniaxial (-), e=1.552, w=1.53, bire=0.0220.
Calculated Properties of Truscottite
Electron Density:	relectron=2.54 gm/cc note: rTruscottite =2.54 gm/cc.
Fermion Index	Fermion Index = 0.0138 Boson Index = 0.9862
Photoelectric:	PETruscottite = 4.75 barns/electron U=PETruscottite x relectron= 12.05 barns/cc.
Radioactivity:	GRapi = 0 (Gamma Ray American Petroleum Institute Units) Truscottite is Not Radioactive
Truscottite Classification
Dana Class:	73.2.2a.2 (73)Phyllosilicate Condensed Tetrahedral Sheets
	(73.2)with double and single layers
	(73.2.2a)Reyerite group (Reyerite Subgroup)
	73.2.2a.1 Reyerite (Na,K)4Ca14Si22Al2O58(OH)8·6(H2O) P 3 3
	73.2.2a.2 Truscottite (Ca,Mn)14Si24O58(OH)8·2(H2O) p3 or p3 Trig
Strunz Class:	VIII/H.34-20 VIII - Silicates
	VIII/H - Phyllosilicates (layered) Mica minerals with other simple layers, [Si6O15]6- and others
	VIII/H.34 - Gyrolite series
	VIII/H.34-10 Minehillite (K,Na)2-3Ca28(Zn4Al4Si40)O112(OH)16 P 63/mmm, P 62c, or P 63mc Hex
	VIII/H.34-20 Truscottite (Ca,Mn)14Si24O58(OH)8·2(H2O) p3 or p3 Trig
	VIII/H.34-25 Orlymanite Ca4Mn3Si8O20(OH)6·2(H2O) P 3-,P 3 Trig
	VIII/H.34-28 Fedorite KNa4Ca4(Al,Si)16O36(OH,F)4·6(H2O) C1 1
	VIII/H.34-30 Reyerite (Na,K)4Ca14Si22Al2O58(OH)8·6(H2O) P 3 3
	VIII/H.34-40 Gyrolite NaCa16Si23AlO60(OH)8·64(H2O) P 61 6
	VIII/H.34-45 Tungusite Ca14(OH)8(Si8O20)3Fe9(OH)14 P1 1
	VIII/H.34-50 Zeophyllite Ca4Si3O8(OH,F)4·2(H2O) R 3 3
	VIII/H.34-70 Armstrongite CaZrSi6O15·3(H2O) C 2 2
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 - Crocoite.com Mineral Locations 4 - EUROmin Project 5 -Google Images 6 -Google Scholar 7 -Handbook of Mineralogy (MinSocAm) 8 -Handbook of Mineralogy (UofA) 9 -MinDAT 10 -MinMax(Deutsch) 11 -MinMax(English) 12 -Mineralienatlas (Deutsch) 13 -QUT Mineral Atlas 14 -École des Mines de Paris

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