Krasnovite Mineral Data

Krasnovite Mineral Data +

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General Krasnovite Information

Chemical Formula:

Ba(Al,Mg)(PO4,CO3)(OH)2·(H2O)

Composition:

Molecular Weight = 301.90 gm

Barium 45.49 % Ba 50.79 % BaO

Magnesium 2.01 % Mg 3.34 % MgO

Aluminum 6.70 % Al 12.66 % Al₂O₃

Phosphorus 7.69 % P 17.63 % P₂O₅

Hydrogen 1.34 % H 11.93 % H₂O

Carbon 0.99 % C 3.64 % CO₂

Oxygen 35.77 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

BaAl_0.75Mg_0.25(PO₄)_0.75(CO₃)_0.25(OH)₂·(H₂O)

Environment:

Dolomite veins.

IMA Status:

Approved IMA 1996 (Dana # Added)

Locality:

Kovdor on the Kola Peninsula, Russia. Link to MinDat.org Location Data.

Name Origin:

For N. I. Krasnova (1941-), mineralogist at St. Petersburg University.

Synonym:

IMA1991-020

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Krasnovite Crystallography

Axial Ratios:

a:b:c =1.5768:1:1.9532

Cell Dimensions:

a = 8.939, b = 5.669, c = 11.073, Z = 4; V = 561.13 Den(Calc)= 3.57

Crystal System:

Orthorhombic - DipyramidalH-M Symbol (2/m 2/m 2/m) Space Group: Pnna,Pnnn

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

By Intensity(I/I_o): 2.768(1), 3.479(0.82), 5.54(0.79),2.543(0.61),

Physical Properties of Krasnovite

Cleavage:

[010] Good

Color:

Pale blue.

Density:

3.7

Diaphaniety:

Translucent

Fracture:

Fibrous - Thin, elongated fractures produced by crystal forms or intersecting cleavages (e.g. asbestos).

Habit:

Fibrous - Crystals made up of fibers.

Habit:

Spherical - Spherical, rounded aggregates.

Hardness:

2 - Gypsum

Luminescence:

Non-fluorescent.

Luster:

Silky

Streak:

white

Optical Properties of Krasnovite

Gladstone-Dale:

CI meas= 0.048 (Good) - where the CI = (1-KPDmeas/KC)
CI calc= 0.014 (Superior) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.176,KPDmeas= 0.1698,KC= 0.1784

Optical Data:

Biaxial (-), a=1.616, b=1.629, g=1.64, bire=0.0240, 2V(Calc)=84, 2V(Meas)=70 -90. Dispersion strong, r > v.

Pleochroism (x):

none.

Pleochroism (y):

none.

Pleochroism (z):

none.

Calculated Properties of Krasnovite

Electron Density:

r_electron=3.30 gm/cc
note: r_Krasnovite=3.57 gm/cc.

Fermion Index

Fermion Index = 0.08336
Boson Index = 0.91664

Photoelectric:

PE_Krasnovite= 198.00 barns/electron
U=PE_Krasnovite x r_electron= 653.23 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Krasnovite is Not Radioactive

Krasnovite Classification

Dana Class:

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

(42.7)where (AB)5 (XO4)3 Zq · x(H2O)

(42.7.2)Dana Group

42.7.2.1 Foggite CaAl(PO4)(OH)2·(H2O) A2122 2 2 2

42.7.2.2 Krasnovite ! Ba(Al,Mg)(PO4,CO3)(OH)2·(H2O) Pnna,Pnnn 2/m 2/m 2/m

Strunz Class:

VII/D.50-25 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.50 - Matulaite - Morinite series

VII/D.50-10 Matulaite CaAl18(PO4)12(OH)20·28(H2O) P 2₁/c 2/m

VII/D.50-20 Foggite CaAl(PO4)(OH)2·(H2O) A2122 2 2 2

VII/D.50-25 Krasnovite Ba(Al,Mg)(PO4,CO3)(OH)2·(H2O) Pnna,Pnnn 2/m 2/m 2/m

VII/D.50-30 Morinite NaCa2Al2(PO4)2(F,OH)5·2(H2O) P 2₁/m 2/m

Other Krasnovite Information

References:

NAME( MinRec, Vol. 28, No. 3) PHYS. PROP.(Am.Min.,Vol.82,p621,1997) OPTIC PROP.(MinRec, Vol. 28, No. 3)

See Also:

Links to other databases for Krasnovite :
1 -Am. Min. Crystal Structure Database 2 -Athena 3 - EUROmin Project 4 -Google Images 5 -Google Scholar 6 -Handbook of Mineralogy (UofA) 7 -MinDAT 8 -MinMax(Deutsch) 9 -MinMax(English) 10 -Mineralienatlas (Deutsch) 11 -QUT Mineral Atlas 12 -École des Mines de Paris

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Krasnovite

Ba(Al,Mg)(PO4,CO3)(OH)2·(H2O)
Dana No: 42.7.2.2 Strunz No: VII/D.50-25
Locality:

Notes: