Mitridatite Mineral Data

Mitridatite Mineral Data +

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General Mitridatite Information

Chemical Formula:

Ca2Fe+++3(PO4)3O2·3(H2O)

Composition:

Molecular Weight = 634.66 gm

Calcium 12.63 % Ca 17.67 % CaO

Iron 26.40 % Fe 37.74 % Fe₂O₃

Phosphorus 14.64 % P 33.55 % P₂O₅

Hydrogen 0.95 % H 8.52 % H₂O

Oxygen 45.38 % O

______ ______

100.00 % 97.48 % = TOTAL OXIDE

Empirical Formula:

Ca₂Fe³⁺₃(PO₄)₃O₃·3(H₂O)

Environment:

Sedimentary oolitic iron ores.

IMA Status:

Valid Species (Pre-IMA) 1914

Locality:

Mithridat Hill, Kerch, Crimea, Russia. Link to MinDat.org Location Data.

Name Origin:

Named for the locality.

Synonym:

ICSD 1017

PDF 26-1057

Mitridatite Image

Images:

Mitridatite

Comments: Dark brown crystals of mitridatite on whitlockite.
Location: Tip Top mine, Custer, Custer County, South Dakota, USA. Scale: Not Given.
© Lou Perloff / Photo Atlas of Minerals

Mitridatite Crystallography

Axial Ratios:

a:b:c =0.9054:1:0.5813

Cell Dimensions:

a = 17.52, b = 19.35, c = 11.25, Z = 12; beta = 95.92° V = 3,793.55 Den(Calc)= 3.33

Crystal System:

Monoclinic - PrismaticH-M Symbol (2/m) Space Group: A2/a

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

By Intensity(I/I_o): 8.64(1), 2.721(0.7), 5.55(0.6),

Physical Properties of Mitridatite

Cleavage:

[100] Good

Color:

Bronze red, Brown green, Green, Greenish yellow, Yellow brown.

Density:

3.24

Diaphaniety:

Translucent to Opaque

Fracture:

Brittle - Uneven - Very brittle fracture producing uneven fragments.

Habit:

Massive - Uniformly indistinguishable crystals forming large masses.

Habit:

Nodular - Tuberose forms having irregular protuberances over the surface.

Hardness:

3.5 - Copper Penny

Luster:

Adamantine - Resinous

Streak:

olive green

Optical Properties of Mitridatite

Gladstone-Dale:

CI meas= -0.038 (Excellent) - where the CI = (1-KPDmeas/KC)
CI calc= -0.01 (Superior) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2487,KPDmeas= 0.2557,KC= 0.2463

Optical Data:

Biaxial (-), a=1.785, b=1.85, g=1.85, bire=0.0650, 2V(Calc)=0, 2V(Meas)=5-10.

Calculated Properties of Mitridatite

Electron Density:

r_electron=3.28 gm/cc
note: r_Mitridatite=3.33 gm/cc.

Fermion Index

Fermion Index = 0.00598
Boson Index = 0.99402

Photoelectric:

PE_Mitridatite= 10.10 barns/electron
U=PE_Mitridatite x r_electron= 33.16 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Mitridatite is Not Radioactive

Mitridatite Classification

Dana Class:

42.8.4.1 (42)Hydrated Phosphates, etc., Containing Hydroxyl or Halogen

(42.8)where (AB)7 (XO4)4 Zq · x(H2O)

(42.8.4)Dana Group

42.8.4.1 Mitridatite Ca2Fe3(PO4)3O2·3(H2O) A2/a 2/m

42.8.4.2 Robertsite Ca6Mn9(PO4)9O6(H2O)6·3(H2O) A2/a 2/m

42.8.4.3 Arseniosiderite Ca2Fe3(AsO4)3O2·3(H2O) A2/a 2/m

Strunz Class:

VII/D.30-30 VII - Phosphates, Arsenates and Vanadates

VII/D - Water-bearing phosphates with unfamiliar anions, cations of very big and medium size: Al, Mg and Ca, Na, K

VII/D.30 - Mitridatite series

VII/D.30-10 Xanthoxenite Ca4Fe2(PO4)4(OH)2·3(H2O) P1 1

VII/D.30-20 Kolfanite Ca2Fe3O2(AsO4)3·2(H2O) A2/a 2/m

VII/D.30-30 Mitridatite Ca2Fe3(PO4)3O2·3(H2O) A2/a 2/m

VII/D.30-40 Arseniosiderite Ca2Fe3(AsO4)3O2·3(H2O) A2/a 2/m

VII/D.30-45 Sailaufite! Ca2Mn3O2(AsO4)2(CO3)·3(H2O) Cm m

VII/D.30-50 Robertsite Ca6Mn9(PO4)9O6(H2O)6·3(H2O) A2/a 2/m

VII/D.30-60 Pararobertsite Ca2Mn3(PO4)3O2·3(H2O) P 2₁/c 2/m

Other Mitridatite Information

References:

NAME( Dana8) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990)

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Mitridatite

Ca2Fe+++3(PO4)3O2·3(H2O)
Dana No: 42.8.4.1 Strunz No: VII/D.30-30
Locality:

Notes: