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Rankinite Mineral Data

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General Rankinite Information

Help on Chemical  Formula: Chemical Formula: Ca3Si2O7
Help on Composition: 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
Help on Empirical Formula: Empirical Formula: Ca3Si2O7
Help on Environment: Environment: In high-temperature calc-silicate skarns.
Help on IMA Status: IMA Status: Valid Species (Pre-IMA) 1942
Help on Locality: Locality: From Scawt Hill, near Larne, Co. Antrim, Ireland. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for George Atwater Rankin (1884-?), physical chemist of the Geophysical Laboratory, Washington, D.C., USA,
Help on Name Pronunciation: Name Pronunciation: Rankinite + Pronunciation Say RANKINITE
Help on Synonym: Synonym: ICSD 2282
  PDF 22-539

Rankinite Crystallography

Help on Axial Ratios: Axial Ratios: a:b:c =1.188:1:0.884
Help on Cell Dimensions: Cell Dimensions: a = 10.55, b = 8.88, c = 7.85, Z = 4; beta = 120.1° V = 636.25 Den(Calc)= 3.01
Help on Crystal System: Crystal System: Monoclinic - Prismatic H-M Symbol (2/m) Space Group: P 21/a
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 2.72(1), 3.18(0.8), 4.48(0.7),

Physical Properties of Rankinite

Help on Cleavage: Cleavage: None
Help on Color: Color: Colorless, White.
Help on Density: Density: 2.96 - 3, Average = 2.98
Help on Diaphaneity: Diaphaneity: Transparent
Help on Hardness: Hardness: 5.5 - Knife Blade
Help on Luster: Luster: Vitreous (Glassy)
Help on Streak: Streak: white

Optical Properties of Rankinite

Help on Gladstone-Dale: 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
Ncalc = 1.62 - 1.63
Help on Optical Data: 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

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=3.01 gm/cc
note: Specific Gravity of Rankinite =3.01 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.0098448395
Boson Index = 0.9901551605
Help on Photoelectric: Photoelectric: PERankinite = 5.85 barns/electron
U=PERankinite x rElectron Density= 17.59 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Rankinite is Not Radioactive

Rankinite Classification

Help on  Dana Class: Dana Class: (55)Sorosilicate Si2O7 Groups, Generally with No Additional Anions
  (55.03)with cations in [7] coordination
  (55.03.01)Dana Group Rankinite Ca3Si2O7 P 21/a 2/m
Help on  Strunz Class: Strunz Class: 09.BC.15 09 - SILICATES (Germanates)
  09.B - Sorosilicates
  09.BC -Si2O7 groups, without non-tetrahedral anions;
09.BC.15 Rankinite Ca3Si2O7 P 21/a 2/m

Other Rankinite Information

Help on References: References: NAME( AntBidBlaNic2) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Heinrich65)
Help on See Also: See Also: Links to other databases for Rankinite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - EUROmin Project
4 - Ecole des Mines de Paris
5 - GeoScienceWorld
6 - Google Images
7 - Google Scholar
8 - Handbook of Mineralogy (MinSocAm)
9 - Handbook of Mineralogy (UofA)
10 - MinDAT
11 - Mineralienatlas (Deutsch)
12 - Online Mineral Museum
13 - QUT Mineral Atlas
14 - Ruff.Info

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Dana No: Strunz No: 09.BC.15





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