Trolleite Mineral Data

Trolleite Mineral Data +

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General Trolleite Information

Chemical Formula:

Al4(PO4)3(OH)3

Composition:

Molecular Weight = 443.86 gm

Aluminum 24.32 % Al 45.94 % Al₂O₃

Phosphorus 20.93 % P 47.97 % P₂O₅

Hydrogen 0.68 % H 6.09 % H₂O

Oxygen 54.07 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

Al₄(PO₄)₃(OH)₃

IMA Status:

Valid Species (Pre-IMA) 1868

Locality:

Link to MinDat.org Location Data.

Synonym:

ICSD 6193

PDF 42-1352

Trolleite Image

Images:

Trolleite Berlinite

Comments: Pinkish crystalline berlinite with blue trolleite.
Location: Ijzer Mine, Vestana, Christiansted, Varmland, Sweden. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Images:

Trolleite Lazulite

Comments: Pale blue trolleite with darker blue lazulite.
Location: Champion Mine, White Mountains, Mono County, California. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Images:

Trolleite Viseite

Comments: Chalky white massive viseite with bluish trolleite.
Location: Champion Sillimanite Mine, near Laws, Mono County, California, USA. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Trolleite Crystallography

Axial Ratios:

a:b:c =2.6384:1:1.0001

Cell Dimensions:

a = 18.894, b = 7.161, c = 7.162, Z = 4; beta = 99.99° V = 954.33 Den(Calc)= 3.09

Crystal System:

Monoclinic - PrismaticH-M Symbol (2/m) Space Group: I2/c

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

By Intensity(I/I_o): 3.208(1), 3.095(0.9), 3.075(0.5),

Crystal Structure:

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Moore P B , Araki T , American Mineralogist , 59 (1974) p.974-984, Trolleite, Al4(OH)3[PO4]3: A very dense structure with octahedral, face-sharing dimers

Physical Properties of Trolleite

Cleavage:

[???] Indistinct

Color:

Light blue, Light green.

Density:

3.09

Fracture:

Conchoidal - Uneven - Uneven fracture producing small, conchoidal fragments.

Hardness:

5.5-6 - Knife Blade-Orthoclase

Luster:

Vitreous (Glassy)

Streak:

white

Optical Properties of Trolleite

Gladstone-Dale:

CI meas= -0.007 (Superior) - where the CI = (1-KPDmeas/KC)
CI calc= -0.007 (Superior) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2051,KPDmeas= 0.2051,KC= 0.2036

Optical Data:

Biaxial (-), a=1.619, b=1.639, g=1.643, bire=0.0240, 2V(Calc)=46, 2V(Meas)=49.

Calculated Properties of Trolleite

Electron Density:

r_electron=3.06 gm/cc
note: r_Trolleite=3.09 gm/cc.

Fermion Index

Fermion Index = 0.00026
Boson Index = 0.99974

Photoelectric:

PE_Trolleite= 1.72 barns/electron
U=PE_Trolleite x r_electron= 5.28 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Trolleite is Not Radioactive

Trolleite Classification

Dana Class:

41.11.1.1 (41)Anhydrous Phosphates, etc. Containing Hydroxyl or Halogen

(41.11)with miscellaneous formulae

(41.11.1)Dana Group

41.11.1.1 Trolleite Al4(PO4)3(OH)3 I2/c 2/m

Strunz Class:

VII/B.08-10 VII - Phosphates, Arsenates and Vanadates

VII/B - Waterfree phosphates with unfamiliar anions F, Cl, O,OH, cations of medium size: Mg, Mn, Fe, Cu, Zn, Pseudomalachite group and related compounds

VII/B.08 - Lazulite group, Trolleite - Richellite

VII/B.08-10 Trolleite Al4(PO4)3(OH)3 I2/c 2/m

VII/B.08-20 Lazulite MgAl2(PO4)2(OH)2 P 2₁/c 2/m

VII/B.08-30 Scorzalite (Fe,Mg)Al2(PO4)2(OH)2 P 2/c 2/m

VII/B.08-40 Barbosalite FeFe2(PO4)2(OH)2 P 2₁/c 2/m

VII/B.08-50 Hentschelite CuFe2(PO4)2(OH)2 P 2₁/n 2/m

VII/B.08-55 Wilhelmkleinite! ZnFe3(AsO4)2(OH)2 P 2₁/n 2/m

VII/B.08-60 Lipscombite (Fe,Mn)Fe2(PO4)2(OH)2 P 4₁2₁2 4 2 2

VII/B.08-70 Richellite Ca3Fe10(PO4)8(OH)12·n(H2O) P 4 4

Other Trolleite Information

References:

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

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

Trolleite

Al4(PO4)3(OH)3
Dana No: 41.11.1.1 Strunz No: VII/B.08-10
Locality:

Notes: