Fermorite Mineral Data

Fermorite Mineral Data +

General Fermorite Information

Chemical Formula:

(Ca,Sr)5(AsO4,PO4)3(OH)

Composition:

Molecular Weight = 707.27 gm

Strontium 24.78 % Sr 29.30 % SrO

Calcium 17.00 % Ca 23.79 % CaO

Arsenic 26.48 % As 40.62 % As₂O₅

Phosphorus 2.19 % P 5.02 % P₂O₅

Hydrogen 0.14 % H 1.27 % H₂O

Oxygen 29.41 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

Ca₃Sr₂(AsO₄)_2.5(PO₄)_0.5(OH)

IMA Status:

Valid Species (Pre-IMA) 1911

Locality:

Link to MinDat.org Location Data.

Synonym:

ICSD 71351

PDF 14-215

Fermorite Image

Images:

Fermorite

Comments: Pinkish crystalline massive fermorite.
Location: Sitipar, Chindwara District, India. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Fermorite Crystallography

Axial Ratios:

a:c = 1:0.73089

Cell Dimensions:

a = 9.55, c = 6.98, Z = 2; V = 551.31 Den(Calc)= 4.26

Crystal System:

Hexagonal - DipyramidalH-M Symbol (6/m) Space Group: P 6₃/m

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

By Intensity(I/I_o): 2.86(1), 2.75(0.6), 3.49(0.5),

Crystal Structure:

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drag2 - RMB Resize/Rotate
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Hughes J M , Drexler J W , Neues Jahrbuch fur Mineralogie, Monatshefte , 1991 (1991) p.327-336, Cation substitution in the apatite tetrahedral site:, crystal structures of type hydroxylellestadtite and type fermorite, Locality: Sitipar deposit, India

Physical Properties of Fermorite

Cleavage:

None

Color:

White, Light pink.

Density:

3.518

Diaphaniety:

Translucent

Fracture:

Uneven - Flat surfaces (not cleavage) fractured in an uneven pattern.

Hardness:

5 - Apatite

Luster:

Greasy (Oily)

Streak:

white

Optical Properties of Fermorite

Gladstone-Dale:

CI meas= -0.088 (Poor) - where the CI = (1-KPDmeas/KC)
CI calc= 0.101 (Poor) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1543,KPDmeas= 0.1869,KC= 0.1718

Optical Data:

Uniaxial (-), e=1.655, w=1.66, bire=0.0050.

Calculated Properties of Fermorite

Electron Density:

r_electron=3.29 gm/cc
note: r_Fermorite=3.52 gm/cc.

Fermion Index

Fermion Index = 0.01771
Boson Index = 0.98229

Photoelectric:

PE_Fermorite= 48.61 barns/electron
U=PE_Fermorite x r_electron= 160.06 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Fermorite is Not Radioactive

Fermorite Classification

Dana Class:

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

(41.8)where (A)5 (XO4)3 Zq

(41.8.3)Dana Group

41.8.3.1 Svabite Ca5(AsO4)3F P 6₃/m 6/m

41.8.3.2 Turneaureite Ca5[(As,P)O4]3Cl P 6₃/m 6/m

41.8.3.3 Johnbaumite Ca5(AsO4)3(OH) P 6₃/m,P 6₃ Hex

41.8.3.4 Fermorite (Ca,Sr)5(AsO4,PO4)3(OH) P 6₃/m 6/m

Strunz Class:

VII/B.39-90 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.39 - Apatite - Pyromorphite group

VII/B.39-10 Fluorapatite Ca5(PO4)3F P 6₃/m 6/m

VII/B.39-20 Chlorapatite Ca5(PO4)3Cl P 6₃/m 6/m

VII/B.39-30 Hydroxylapatite Ca5(PO4)3(OH) P 6₃/m 6/m

VII/B.39-40 Carbonate-hydroxylapatite Ca5(PO4,CO3)3(OH) P 6₃/m 6/m

VII/B.39-50 Carbonate-fluorapatite Ca5(PO4,CO3)3F P 6₃/m 6/m

VII/B.39-60 Svabite Ca5(AsO4)3F P 6₃/m 6/m

VII/B.39-70 Turneaureite Ca5[(As,P)O4]3Cl P 6₃/m 6/m

VII/B.39-80 Johnbaumite Ca5(AsO4)3(OH) P 6₃/m,P 6₃ Hex

VII/B.39-90 Fermorite (Ca,Sr)5(AsO4,PO4)3(OH) P 6₃/m 6/m

VII/B.39-95 Fluorcaphite! (Ca,Sr,Ce,Na)5(PO4)3F P 6₃ 6

VII/B.39-100 Strontium-apatite (Sr,Ca)5(PO4)3(F,OH) P 6₃/m 6/m

VII/B.39-110 Belovite-(Ce) (Sr,Ce,Na,Ca)5(PO4)3(OH) P 3 3

VII/B.39-115 Belovite-(La)! (Sr,La,Ce,Ca)5(PO4)3(F,OH) P 3 3

VII/B.39-117 Kuannersuite-(Ce)! Ba6Na2REE2(PO4)6FCl P 3 3

VII/B.39-120 Alforsite Ba5(PO4)3Cl P 6₃/m 6/m

VII/B.39-130 Morelandite (Ba,Ca,Pb)5(AsO4,PO4)3Cl P 6₃/m,P 6₃ Hex

VII/B.39-140 Hedyphane Ca2Pb3(AsO4)3Cl P 6₃/m 6/m

VII/B.39-150 Pyromorphite Pb5(PO4)3Cl P 6₃/m 6/m

VII/B.39-160 Mimetite Pb5(AsO4)3Cl P 6₃/m 6/m

VII/B.39-165 Clinomimetite Pb5(AsO4)3Cl P 2₁/b 2/m

VII/B.39-170 Vanadinite Pb5(VO4)3Cl P 6₃/m 6/m

Other Fermorite Information

References:

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

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Fermorite

(Ca,Sr)5(AsO4,PO4)3(OH)
Dana No: 41.8.3.4 Strunz No: VII/B.39-90
Locality:

Notes: