Attakolite Mineral Data

Attakolite Mineral Data +

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General Attakolite Information

Chemical Formula:

(Ca,Sr)Mn++(Al,Fe+++)4[(Si,P)O4]H(PO4)3(OH)4

Composition:

Molecular Weight = 668.01 gm

Strontium 2.62 % Sr 3.10 % SrO

Calcium 4.80 % Ca 6.72 % CaO

Manganese 8.22 % Mn 10.62 % MnO

Aluminum 14.94 % Al 28.24 % Al₂O₃

Iron 2.51 % Fe 3.59 % Fe₂O₃

Silicon 2.94 % Si 6.30 % SiO₂

Phosphorus 15.30 % P 35.06 % P₂O₅

Hydrogen 0.75 % H 6.74 % H₂O

Oxygen 47.90 % O

______ ______

100.00 % 100.36 % = TOTAL OXIDE

Empirical Formula:

Ca_0.8Sr_0.2Mn²⁺Al_3.7Fe³⁺_0.3H(SiO₄)_0.7(PO₄)_3.3(OH)₄

Environment:

In an iron deposit.

IMA Status:

Valid Species (Pre-IMA) 1868

Locality:

Vatana mine, near Nasum, Kristianstad, Sweden. Link to MinDat.org Location Data.

Name Origin:

Named from the Greek for "salmon" for the pale pink color.

Synonym:

Attacolite

ICSD 67528

PDF 18-146

Attakolite Image

Images:

Attakolite

Comments: Pink to yellowish attakolite with black hematite.
Location: Vestana Iron Mine, near Nasum, Skane, Varmland, Sweden. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Attakolite Crystallography

Axial Ratios:

a:b:c =1.4976:1:0.6379

Cell Dimensions:

a = 17.188, b = 11.477, c = 7.322, Z = 4; beta = 113.83° V = 1,321.25 Den(Calc)= 3.36

Crystal System:

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

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

By Intensity(I/I_o): 3.077(1), 2.4(0.4), 3.121(0.3),

Crystal Structure:

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Grice J D , Dunn P J , American Mineralogist , 77 (1992) p.1285-1291, Attakolite: New data and crystal-structure determination

Physical Properties of Attakolite

Color:

White, Pink, Pale red.

Density:

3.09 - 3.23, Average = 3.16

Diaphaniety:

Translucent

Habit:

Massive - Uniformly indistinguishable crystals forming large masses.

Hardness:

5 - Apatite

Optical Properties of Attakolite

Gladstone-Dale:

CI meas= 0.003 (Superior) - where the CI = (1-KPDmeas/KC)
CI calc= 0.062 (Fair) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1964,KPDmeas= 0.2088,KC= 0.2094

Optical Data:

Biaxial (+), a=1.65-1.655, b=1.654-1.664, g=1.661-1.675, bire=0.0110-0.0200, 2V(Calc)=76-86, 2V(Meas)=75-84.

Calculated Properties of Attakolite

Electron Density:

r_electron=3.11 gm/cc
note: r_Attakolite=3.16 gm/cc.

Fermion Index

Fermion Index = 0.00403
Boson Index = 0.99597

Photoelectric:

PE_Attakolite= 7.52 barns/electron
U=PE_Attakolite x r_electron= 23.39 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Attakolite is Not Radioactive

Attakolite Classification

Dana Class:

43.4.13.1 (43)Compound Phosphates, etc.

(43.4)(Anhydrous Compound Anions With Hydroxyl or Halogen)

(43.4.13)Dana Group

43.4.13.1 Attakolite (Ca,Sr)Mn(Al,Fe)4[(Si,P)O4]H(PO4)3(OH)4 C 2/m 2/m

Strunz Class:

VII/B.28-30 VII - Phosphates, Arsenates and Vanadates

VII/B - Waterfree phosphates with unfamiliar anions F, Cl, O, OH. cations of medium and big size: Mg, Cu, Zn, and Ca, Na, K, Ba, Pb

VII/B.28 - Carminite series

VII/B.28-10 Bertossaite Li2CaAl4(PO4)4(OH)4 Imaa,Iaa2 Ortho

VII/B.28-20 Palermoite (Sr,Ca)(Li,Na)2Al4(PO4)4(OH)4 I mmm 2/m 2/m 2/m

VII/B.28-30 Attakolite (Ca,Sr)Mn(Al,Fe)4[(Si,P)O4]H(PO4)3(OH)4 C 2/m 2/m

VII/B.28-35 Sewardite! CaFe2(AsO4)2(OH)2 C ccm 2/m 2/m 2/m

VII/B.28-40 Carminite PbFe2(AsO4)2(OH)2 C ccm 2/m 2/m 2/m

VII/B.28-60 Leningradite PbCu3(VO4)Cl2 I bam 2/m 2/m 2/m

VII/B.28-70 Namibite CuBi2(VO4)O2 C 2/m,Cm,C 2 Mono

VII/B.28-80 Paganoite! (Ni,Co)BiAsO5 P1 1

Other Attakolite Information

References:

NAME( AntBidBlaNic2) PHYS. PROP.(AntBidBlaNic2) OPTIC PROP.(AntBidBlaNic2)

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

Attakolite

(Ca,Sr)Mn++(Al,Fe+++)4[(Si,P)O4]H(PO4)3(OH)4
Dana No: 43.4.13.1 Strunz No: VII/B.28-30
Locality:

Notes: