Rankinite Mineral Data

Rankinite Mineral Data +

General Rankinite Information

Chemical Formula:

Ca3Si2O7

Composition:

Molecular Weight = 288.40 gm

Calcium 41.69 % Ca 58.33 % CaO

Silicon 19.48 % Si 41.67 % SiO₂

Oxygen 38.83 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

Ca₃Si₂O₇

IMA Status:

Valid Species (Pre-IMA) 1942

Locality:

Link to MinDat.org Location Data.

Synonym:

ICSD 2282

PDF 22-539

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Rankinite Crystallography

Axial Ratios:

a:b:c =1.188:1:0.884

Cell Dimensions:

a = 10.55, b = 8.88, c = 7.85, Z = 4; beta = 120.1° V = 636.25 Den(Calc)= 3.01

Crystal System:

Monoclinic - PrismaticH-M Symbol (2/m) Space Group: P 2₁/a

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

By Intensity(I/I_o): 2.72(1), 3.18(0.8), 4.48(0.7),

Physical Properties of Rankinite

Cleavage:

None

Color:

Colorless, White.

Density:

2.96 - 3, Average = 2.98

Diaphaniety:

Transparent

Hardness:

5.5 - Knife Blade

Luster:

Vitreous (Glassy)

Streak:

white

Optical Properties of Rankinite

Gladstone-Dale:

CI meas= -0.035 (Excellent) - where the CI = (1-KPDmeas/KC)
CI calc= -0.024 (Excellent) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2142,KPDmeas= 0.2164,KC= 0.2092

Optical Data:

Biaxial (+), a=1.64-1.641, b=1.644, g=1.65, bire=0.0090-0.0100, 2V(Calc)=72-80, 2V(Meas)=64.

Calculated Properties of Rankinite

Electron Density:

r_electron=3.01 gm/cc
note: r_Rankinite=3.01 gm/cc.

Fermion Index

Fermion Index = 0.00984
Boson Index = 0.99016

Photoelectric:

PE_Rankinite= 5.85 barns/electron
U=PE_Rankinite x r_electron= 17.59 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Rankinite is Not Radioactive

Rankinite Classification

Dana Class:

55.3.1.1 (55)Sorosilicate Si2O7 Groups, Generally with No Additional Anions

(55.3)with cations in [7] coordination

(55.3.1)Dana Group

55.3.1.1 Rankinite Ca3Si2O7 P 2₁/a 2/m

Strunz Class:

VIII/C.03-10 VIII - Silicates

VIII/C - Sorosilicates, with [Si2O7]6-, without anions unfamiliar to tetraheders

VIII/C.03 - Rankinite - Cebollite series

VIII/C.03-10 Rankinite Ca3Si2O7 P 2₁/a 2/m

VIII/C.03-20 Kilchoanite Ca3Si2O7 I2cm mm2

VIII/C.03-30 Cebollite Ca5Al2(SiO4)3(OH)4 Unk Ortho

VIII/C.03-58 Manganokukisvumite! Na6MnTi4Si8O28·4(H2O) Pccn 2/m 2/m 2/m

Other Rankinite Information

References:

PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Heinrich65)

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Print or Cut-and-Paste your Rankinite Specimen Label here :

Rankinite

Ca3Si2O7
Dana No: 55.3.1.1 Strunz No: VIII/C.03-10
Locality:

Notes: