SPHENE                                            NATURAL COLOR                         Hardness 5 - 5.5
Next page   SPHENE 3 SPHENE SPHENE FACET BROWN SPHENE/SCAPOLITE
      Enlarge 24 grms. sphene crystal green. single 

46 x  34.1 x 8.4 mm. ( Transparent )

The SPHENE crystal is externally undamaged.

stone PRICE  

USD 1200.00 

ORIGIN: Ankarafa, Madagascar

ref:TIgr24g 

 

      Enlarge 75.50 cts. sphene crystal green. single 

68 x 23.2 x 5.6 mm. ( Transparent )

The SPHENE crystal is externally undamaged.

stone PRICE  

USD 750.00 

ORIGIN: Ankarafa, Madagascar

ref:TIgr7550c 

 

   Enlarge  15.58 cts. sphene crystal green. single 

23.1 x 15.1 mm. ( Transparent )

The SPHENE crystal is externally undamaged.

stone PRICE  

USD 154.00 

ORIGIN: Ankarafa, Madagascar

ref:TIgr1558ct 

 

       Enlarge 20.50 cts. sphene crystal green. single 

25.8 x 16.7 x 6.1 mm. ( Transparent )

The SPHENE crystal is externally undamaged.

stone PRICE  

USD 220.00 

ORIGIN: Ankarafa, Madagascar

ref:TIgr2050c 

 

       Enlarge 25.17 cts. sphene crystal green. single 

29.5 x 17.8 x 8 mm. ( Transparent )

The SPHENE crystal is externally undamaged.

stone PRICE  

USD 240.00 

ORIGIN: Ankarafa, Madagascar

ref:TIgr2517c 

 

   Enlarge  41.42 cts. sphene crystal green. single 

 47.5 x 19.3 mm. ( Transparent )

The SPHENE crystal is externally very slightly damaged.

stone PRICE  

USD 440.00 

ORIGIN: Ankarafa, Madagascar

ref:TIgr4142ct 

 

   Enlarge  56.25 cts. sphene crystal green. single 

 43.5 x 25 mm.( Transparent )

The SPHENE crystal is externally undamaged.

stone PRICE  

USD 559.00 

ORIGIN: Ankarafa, Madagascar

ref:TIgr5625ct 

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Next page   SPHENE 3 SPHENE SPHENE FACET SPHENE SPHENE FACET BROWN SPHENE/SCAPOLITE
General Information
Group of Sphene crystal on matrix.

(EXCEPTIONAL)

1290 grams. 21 x 9 cm. (individual crystal : 6.5 x 3.5 cm.)

ORIGIN: Ankarafa, Madagascar

 

                                   Enlarge

 
Click on the picture to go to facet Sphene. Titanite Article
 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, Switzerland.
 Name Origin: Named after its chemical composition of titanium.
 Synonym: Titanite

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
 
 
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