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SPHENE                                NATURAL COLOR                                 Hardness  5 - 5.5
Next page    SPHENE 1 SPHENE 10 - 51 CTS.  SPHENE affordable price
   9.97 cts. Cab.sphene oval yellow-green. single 

  18.8 x 9.3 mm.

 Enhancement: none (N)

stone PRICE

 USD 239.00 

ORIGIN: Madagascar

 ref:CABTIgo997  

Next page    SPHENE AAA SPHENE 10 - 51 CTS.  SPHENE affordable price

General Information

 Chemical Formula: CaTiSiO5 = CaTiOSiO4
 Composition: Molecular Weight = 196.04 gm
   Calcium 20.44 %  Ca   28.61 % CaO
   Titanium 24.42 %  Ti   40.75 % TiO2
   Silicon  14.33 %  Si   30.65 % SiO2
   Oxygen  40.81 %  O
            ______        ______
            100.00 %      100.00 % = TOTAL OxIDE
 Empirical Formula: CaTiSiO5
 Environment: Magmatic, metamorphic and hydrothermal rocks.
 IMA Status: Approved IMA 1960
 Locality: Laacher See and Eifel, Germany. Madagascar
 Name Origin: Named after its chemical composition of titanium.
 Synonym: Sphene, titanite
 

Titanite Image

 

Click on the picture to go to Sphene crystal.

 

Crystallography

 Axial Ratios: a:b:c =0.7522:1:0.8532
 Cell Dimensions: a = 6.56, b = 8.72, c = 7.44, Z = 4; beta = 119.716 V = 369.62 Den(Calc)= 3.52
 Crystal System: Monoclinic-Prismatic H-M Symbol (2/m) Space Group: P21/a
 x Ray Diffraction: By Intensity(I/Io): 3.233(1) 2.595(0.9) 2.989(0.9)
 
 

Physical Properties

 Cleavage: [110] Distinct, [100] Imperfect, [112] Imperfect
 Color: reddish brown, gray, yellow, green, or red.
 Density: 3.4 - 3.56, Average = 3.48
 Diaphaniety: Transparent to translucent to opaque
 Fracture: Sub Conchoidal - Fractures developed in brittle materials characterized by semi-curving surfaces.
 Habits: Massive - Lamellar - Distinctly foliated fine-grained forms., Crystalline - Fine - Occurs as well-formed fine sized crystals.,
 Hardness: 5-5.5 - Apatite-Knife Blade
 Luminescence: Non-fluorescent.
 Luster: Adamantine - Resinous
 Streak: reddish white
 

Optical Properties

 Optical Data: Biaxial (+), a=1.84-1.95, b=1.87-2.034, g=1.943-2.11, bire=0.1030-0.1600, 2V(Calc)=68-82, 2V(Meas)=20-56. Dispersion r > v extreme.
 Pleochroism (x): colorless, greenish yellow, colorless, or yellowish brown.
 Pleochroism (y): colorless, pink, greenish yellow, yellowish brown, or yellowish green.
 Pleochroism (z): colorless, pink, reddish orange, pale yellow, or grass green.
 

Classification

 Dana Class: Nesosilicate Insular SiO4 Groups and O, OH, F, and H2O
  with cations in [6] and/or > [6] coordination
  Titanite group
 
 Titanite CaTiSiO5=CaTiOSiO4 P21/a 2/m
               Malayaite  CaSnSiO5=CaSnOSiO4 A2/a 2/m
                Vanadomalayaite  CaVOSiO4 C2/c 2/m
 Strunz Class:  Silicates
   Nesosubsilicates, with anions unfamiliar to tetraheders, cationes with coordinationnumber between [8] and [12]
  STRUNZ - Silicates [Nesosubsilicates, with anions unfamiliar to tetraheders, cationes with coordinationnumber between [8] and [12
 
Titanite CaTiSiO5=CaTiOSiO4 P21/a 2/m
                Vanadomalayaite CaVOSiO4 C2/c 2/m
                Malayaite CaSnSiO5=CaSnOSiO4 A2/a 2/m
 
 Trimounsite (Y) (Y,REE)2Ti2SiO9 P21/c 2/m
Next page    SPHENE AAA SPHENE 10 - 51 CTS.  SPHENE affordable price
 
 
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