Matveevite Mineral Data

Matveevite Mineral Data

General Matveevite Information

Chemical Formula:

KTiMn2Fe+++2(PO4)4(OH)3·15(H2O)

Composition:

Molecular Weight = 1,009.69 gm

Potassium 3.87 % K 4.66 % K₂O

Titanium 4.74 % Ti 7.91 % TiO₂

Manganese 10.88 % Mn 14.05 % MnO

Iron 11.06 % Fe 15.82 % Fe₂O₃

Phosphorus 12.27 % P 28.12 % P₂O₅

Hydrogen 3.29 % H 29.44 % H₂O

Oxygen 53.88 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

KTiMn²⁺₂Fe³⁺₂(PO₄)₄(OH)₃·15(H₂O)

Environment:

The Mn end member in the series with paulkerrite. Decomposition product in granitic pegmatite. Discredited as equivalent to benyacarite.

IMA Status:

Discredited IMA 1991

Locality:

Ilmenskih National Park, Ural Mountains, Russia. Link to MinDat.org Location Data.

Name Origin:

Named in 1986 for K. K. Matveev (1875-1954).

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Matveevite Crystallography

Axial Ratios:

a:b:c =0.6052:1:0.5126

Cell Dimensions:

a = 12.42, b = 20.52, c = 10.52, Z = 4; V = 2,681.11 Den(Calc)= 2.50

Crystal System:

OrthorhombicSpace Group: Pnam ro P na2₁

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

By Intensity(I/I_o): 6.23(1), 3.15(0.9), 10.4(0.9),7.5(0.8), 2.86(0.4),

Physical Properties of Matveevite

Cleavage:

[010] Perfect

Color:

Colorless, White, Yellowish white.

Density:

2.32

Diaphaniety:

Transparent to Translucent

Fracture:

Brittle - Irregular - Very brittle fracture producing irregular fragments

Habit:

Platy - Sheet forms (e.g. micas).

Hardness:

2.5 - Finger Nail

Luster:

Vitreous - Pearly

Streak:

white

Optical Properties of Matveevite

Gladstone-Dale:

CI meas= 0.055 (Good) - where the CI = (1-KPDmeas/KC)
CI calc= 0.123 (Poor) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2363,KPDmeas= 0.2546,KC= 0.2693

Optical Data:

Biaxial (+), a=1.574, b=1.58, g=1.618, bire=0.0440

Calculated Properties of Matveevite

Electron Density:

r_electron=2.33 gm/cc
note: r_Matveevite=2.32 gm/cc.

Fermion Index

Fermion Index = 0.00874
Boson Index = 0.99126

Photoelectric:

PE_Matveevite= 7.69 barns/electron
U=PE_Matveevite x r_electron= 17.94 barns/cc.

Radioactivity:

GRapi = 56.21 (Gamma Ray American Petroleum Institute Units)

Estimated Radioactivity from Matveevite - barely detectable

Matveevite Classification

Dana Class:

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

(42.11)where (AB)4 (XO4)3 Zq · x(H2O)

(42.11.21)Dana Group

42.11.21.1 Paulkerrite K(Mg,Mn)2(Fe,Al)2Ti(PO4)4(OH)3·15(H2O) P bca 2/m 2/m 2/m

42.11.21.2 Mantienneite KMg2Al2Ti(PO4)4(OH)3·15(H2O) P bca 2/m 2/m 2/m

42.11.21.3 Matveevite ? KTiMn2Fe2(PO4)4(OH)3·15(H2O) Pnam ro P na2₁ Ortho

42.11.21.4 Benyacarite (H2O,K)2Ti(Mn,Fe)2(Fe,Ti)2Ti(PO4)4(O,F)2·14(H2O) P bca 2/m 2/m 2/m

Strunz Class:

VII/X.00-00 VII - Phosphates, Arsenates and Vanadates

VII/X - Unclassified Strunz Phosphates, Arsenates and Vanadates

VII/X.00 - Phosphate, Basic Hydrated

Other Matveevite Information

References:

NAME( Dana8) PHYS. PROP.(Dana8) OPTIC PROP.(Dana8)

See Also:

Links to other databases for Matveevite :
1 -Am. Min. Crystal Structure Database 2 -Athena 3 -Google Images 4 -Google Scholar 5 -MinDAT 6 -MinMax(Deutsch) 7 -MinMax(English) 8 -Mineralienatlas (Deutsch) 9 -QUT Mineral Atlas

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Matveevite

KTiMn2Fe+++2(PO4)4(OH)3·15(H2O)
Dana No: 42.11.21.3 Strunz No: VII/X.00-00
Locality:

Notes: