Collinsite Mineral Data

Collinsite Mineral Data +

General Collinsite Information

Chemical Formula:

Ca2(Mg,Fe++)(PO4)2·2(H2O)

Composition:

Molecular Weight = 338.32 gm

Calcium 23.69 % Ca 33.15 % CaO

Magnesium 5.39 % Mg 8.93 % MgO

Iron 4.13 % Fe 5.31 % FeO

Phosphorus 18.31 % P 41.96 % P₂O₅

Hydrogen 1.19 % H 10.65 % H₂O

Oxygen 47.29 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

Ca₂Mg_0.75Fe²⁺_0.25(PO₄)₂·2(H₂O)

IMA Status:

Valid Species (Pre-IMA) 1927

Locality:

Link to MinDat.org Location Data.

Synonym:

ICSD 4258

PDF 26-1063

Collinsite Image

Images:

Collinsite

Comments: Half nodule of nearly pure collinsite. The center of the specimen is a small piece of volcanic rock surrounded by collinsite.
Location: Francois Lake, British Columbia, Canada. Scale: 7 x 5.5 cm.
© John Veevaert

Collinsite Crystallography

Axial Ratios:

a:b:c =0.8457:1:0.8025

Cell Dimensions:

a = 5.734, b = 6.78, c = 5.441, Z = 1; alpha = 97.29°, beta = 108.56°, gamma = 107.28° V = 189.93 Den(Calc)= 2.96

Crystal System:

Triclinic - PinacoidalH-M Symbol ( 1) Space Group: P1

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

By Intensity(I/I_o): 3.04(1), 2.682(0.9), 2.713(0.8),

Crystal Structure:

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drag1 - LMB Manipulate Structure
drag2 - RMB Resize/Rotate
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H - Help Screen
I - Data Info
A - Atoms On/Off
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Brotherton P D , Maslen E N , Pryce M W , White A H , Australian Journal of Chemistry , 27 (1974) p.653-656, Crystal structure of collinsite

Physical Properties of Collinsite

Cleavage:

[001] Perfect, [010] Perfect

Color:

Colorless, White, Light brown.

Density:

2.95

Diaphaniety:

Transparent to Translucent

Fracture:

Brittle - Generally displayed by glasses and most non-metallic minerals.

Hardness:

3-3.5 - Calcite-Copper Penny

Luminescence:

Non-fluorescent.

Luster:

Silky

Streak:

white

Optical Properties of Collinsite

Gladstone-Dale:

CI meas= -0.037 (Excellent) - where the CI = (1-KPDmeas/KC)
CI calc= -0.033 (Excellent) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2175,KPDmeas= 0.2182,KC= 0.2105

Optical Data:

Biaxial (+), a=1.632, b=1.642, g=1.657, bire=0.0250

Calculated Properties of Collinsite

Electron Density:

r_electron=2.97 gm/cc
note: r_Collinsite=2.96 gm/cc.

Fermion Index

Fermion Index = 0.00681
Boson Index = 0.99319

Photoelectric:

PE_Collinsite= 5.11 barns/electron
U=PE_Collinsite x r_electron= 15.15 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Collinsite is Not Radioactive

Collinsite Classification

Dana Class:

40.2.2.3 (40)Hydrated Phosphates, etc

(40.2)where A++ (B++)2 (XO4) · x(H2O)

(40.2.2)Fairfieldite Subgroup (Triclinic: P1¯)

40.2.2.1 Fairfieldite Ca2(Mn,Fe)(PO4)2·2(H2O) P1 1

40.2.2.2 Messelite Ca2(Fe,Mn)(PO4)2·2(H2O) P1 1

40.2.2.3 Collinsite Ca2(Mg,Fe)(PO4)2·2(H2O) P1 1

40.2.2.4 Cassidyite Ca2(Ni,Mg)(PO4)2·2(H2O) P1 1

40.2.2.5 Talmessite Ca2Mg(AsO4)2·2(H2O) P1 1

40.2.2.6 Gaitite Ca2Zn(AsO4)2·2(H2O) P1 1

40.2.2.7 Roselite-beta Ca2(Co,Mg)(AsO4)2·2(H2O) P 1 or P1 Tri

40.2.2.8 Parabrandtite Ca2Mn(AsO4)·2(H2O) P1,P 1 Tri

40.2.2.9 Hillite! Ca2(Zn,Mg)[PO4]2·2(H2O) P1 1

Strunz Class:

VII/C.17-10 VII - Phosphates, Arsenates and Vanadates

VII/C - Water-bearing phosphates without unfamiliar anions, cations of medium and big size: Fe, Mn, Zn, Mg and Ca, (NH4)1+

VII/C.17 - Collinsite - Wendwilsonite series

VII/C.17-10 Collinsite Ca2(Mg,Fe)(PO4)2·2(H2O) P1 1

VII/C.17-15 Hillite! Ca2(Zn,Mg)[PO4]2·2(H2O) P1 1

VII/C.17-20 Messelite Ca2(Fe,Mn)(PO4)2·2(H2O) P1 1

VII/C.17-30 Fairfieldite Ca2(Mn,Fe)(PO4)2·2(H2O) P1 1

VII/C.17-40 Cassidyite Ca2(Ni,Mg)(PO4)2·2(H2O) P1 1

VII/C.17-50 Talmessite Ca2Mg(AsO4)2·2(H2O) P1 1

VII/C.17-60 Gaitite Ca2Zn(AsO4)2·2(H2O) P1 1

VII/C.17-70 Parabrandtite Ca2Mn(AsO4)·2(H2O) P1,P 1 Tri

VII/C.17-80 Roselite-beta Ca2(Co,Mg)(AsO4)2·2(H2O) P 1 or P1 Tri

VII/C.17-90 Wendwilsonite Ca2(Mg,Co)(AsO4)2·2(H2O) P 2₁/c 2/m

VII/C.17-100 Roselite Ca2(Co,Mg)(AsO4)2·2(H2O) P 2₁/c 2/m

VII/C.17-110 Brandtite Ca2(Mn,Mg)(AsO4)2·2(H2O) P 2₁/c 2/m

VII/C.17-120 Zincroselite Ca2Zn(AsO4)2·2(H2O) P 2₁/c 2/m

Other Collinsite Information

References:

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

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Collinsite

Ca2(Mg,Fe++)(PO4)2·2(H2O)
Dana No: 40.2.2.3 Strunz No: VII/C.17-10
Locality:

Notes: