Batisite Mineral Data

Batisite Mineral Data +

General Batisite Information

Chemical Formula:

BaNaNaTi2O2[Si4O12]

Composition:

Molecular Weight = 624.94 gm

Potassium 3.75 % K 4.52 % K₂O

Barium 26.37 % Ba 29.44 % BaO

Sodium 0.74 % Na 0.99 % Na₂O

Titanium 15.32 % Ti 25.56 % TiO₂

Silicon 17.98 % Si 38.46 % SiO₂

Oxygen 35.84 % O

______ ______

100.00 % 98.98 % = TOTAL OXIDE

Empirical Formula:

Ba_1.2K_0.6Na_0.2Ti₂Si₄O₁₄

Environment:

In aegirine-arfvedsonite-microcline pegmatites in dunites (Inagli massif, Russia).

IMA Status:

Approved IMA 1960

Locality:

From the Ingali massif, 30 km west of Aldan; the Murun massif, southwest of Olekminsk, Yakutia; and on Mt. Rasvumchorr, Khibiny massif, Kola Peninsula, Russia. Link to MinDat.org Location Data.

Name Origin:

For Ba, Ti, Si in the composition.

Synonym:

ICSD 76521

PDF 14-636

Batisite Image

Images:

Batisite

Comments: Vitreous, translucent, brownish orange crystals of batisite.
Location: Malyi Murun, Siberia, Russia. Scale: crystals up to 4 to 7 mm.
© John Veevaert

Batisite Crystallography

Axial Ratios:

a:b:c =0.7516:1:0.5819

Cell Dimensions:

a = 10.41, b = 13.85, c = 8.06, Z = 4; V = 1,162.08 Den(Calc)= 3.57

Crystal System:

Orthorhombic - PyramidalH-M Symbol (mm2) Space Group: Ima2

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

By Intensity(I/I_o): 2.91(1), 2.16(0.5), 3.39(0.5),

Crystal Structure:

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Schmahl W W , Tillmanns E , Neues Jahrbuch fur Mineralogie, Monatshefte , 1987 (1987) p.107-118, Isomorphic substitutions, straight Si-O-Si geometry, and disorder of tetrahedral, tilting in batisite, (Ba,K)(K,Na)Na(Ti,Fe,Nb,Zr)Si4O14, Locality: tertiary nephelinite-leucite volcanic rocks, Westeifel, W. Germany

Physical Properties of Batisite

Cleavage:

[100] Good

Color:

Brown pink, Yellow brown, Dark brown.

Density:

3.432

Diaphaniety:

Translucent to Opaque

Hardness:

5.9

Luster:

Vitreous - Greasy

Streak:

pink white

Optical Properties of Batisite

Gladstone-Dale:

CI meas= 0.046 (Good) - where the CI = (1-KPDmeas/KC)
CI calc= 0.083 (Poor) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2099,KPDmeas= 0.2183,KC= 0.2289

Optical Data:

Biaxial (+), a=1.727, b=1.732, g=1.789, bire=0.0620, 2V(Calc)=34, 2V(Meas)=7-40.

Calculated Properties of Batisite

Electron Density:

r_electron=3.22 gm/cc
note: r_Batisite=3.43 gm/cc.

Fermion Index

Fermion Index = 0.07537
Boson Index = 0.92463

Photoelectric:

PE_Batisite= 116.54 barns/electron
U=PE_Batisite x r_electron= 374.79 barns/cc.

Radioactivity:

GRapi = 50.73 (Gamma Ray American Petroleum Institute Units)

Estimated Radioactivity from Batisite - barely detectable

Batisite Classification

Dana Class:

65.3.4.1 (65)Inosilicate Single-Width Unbranched Chains, W=1

(65.3)with chains P=4

(65.3.4)Batisite group

65.3.4.1 Batisite BaNaNaTi2O2[Si4O12] Ima2 mm2

65.3.4.2 Shcherbakovite KKNaTi2O(OH)[Si4O12] I mma 2/m 2/m 2/m

65.3.4.3 Ohmilite Sr3(Ti,Fe)(Si2O6)2(O,OH)·2-3(H2O) P 2₁/m 2/m

Strunz Class:

VIII/F.25-10 VIII - Silicates

VIII/F - Inosilicates (chain and band) Quadruplet chains [Si4O12]8-

VIII/F.25 - Batisite - Ohmilite series

VIII/F.25-10 Batisite BaNaNaTi2O2[Si4O12] Ima2 mm2

VIII/F.25-20 Shcherbakovite KKNaTi2O(OH)[Si4O12] I mma 2/m 2/m 2/m

VIII/F.25-30 Taikanite (Ba,Sr)2Mn2Si4O12 C 2 2

VIII/F.25-40 Krauskopfite BaSi2O4(OH)2·2(H2O) P 2₁/a 2/m

VIII/F.25-50 Ohmilite Sr3(Ti,Fe)(Si2O6)2(O,OH)·2-3(H2O) P 2₁/m 2/m

Other Batisite Information

References:

NAME( AntBidBlaNic2) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990)

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Batisite

BaNaNaTi2O2[Si4O12]
Dana No: 65.3.4.1 Strunz No: VIII/F.25-10
Locality:

Notes: