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SPHENE                                            NATURAL COLOR                         Hardness 5 - 5.5
Next page    SPHENE 2 SPHENE FACET BROWN SPHENE/SCAPOLITE
   30 grms. sphene crystal green. single 

43.9 x 41.7mm. ( Transparent )

The SPHENE crystal is externally slightly damaged.

Enlarge

stone PRICE  

USD Enquire 

ORIGIN: Ankarafa, Madagascar

ref:TIgr30gr 

 

       Enlarge 22.53 cts. sphene crystal green. single 

22.6 x 18.5 x 6.8 mm. ( Transparent )

The SPHENE crystal is externally undamaged.

stone PRICE  

USD 260.00 

ORIGIN: Ankarafa, Madagascar

ref:TIgr2253c 

 

       Enlarge 17.70cts. sphene crystal green. single 

29 x 11.7 x 9.4 mm. ( Transparent )

The SPHENE crystal is externally undamaged.

stone PRICE  

USD 220.00 

ORIGIN: Ankarafa, Madagascar

ref:TIgr1770c 

 

      Enlarge 22 grms. sphene crystal green. single 

68.7 x 28.4 x 6.3 mm. ( Transparent )

The SPHENE crystal is externally undamaged.

stone PRICE  

USD 870.00 

ORIGIN: Ankarafa, Madagascar

ref:TIgr22g

 

       Enlarge 21.33 cts. sphene crystal green. single 

28.7 x 15.9 x 10.1 mm. ( Transparent )

The SPHENE crystal is externally undamaged.

stone PRICE  

USD 220.00 

ORIGIN: Ankarafa, Madagascar

ref:TIgr2133c 

 

      Enlarge 98.20 cts. sphene crystal green. single 

 46.8 x 25.9 x 12.3 mm. ( Transparent )

The SPHENE crystal is externally undamaged.

stone PRICE  

USD 860.00 

ORIGIN: Ankarafa, Madagascar

ref:TIgr9820c 

 

       Enlarge 16.49 cts. sphene crystal green. single 

23 x 15 x 16.8 mm. ( Transparent )

The SPHENE crystal is externally undamaged.

stone PRICE  

USD 179.00 

ORIGIN: Ankarafa, Madagascar

ref:TIgr1649c 

 

       Enlarge 17.65 cts. sphene crystal green. single 

30.7 x 16.6 x 5.3 mm. ( Transparent )

The SPHENE crystal is externally undamaged.

stone PRICE  

USD 189.00 

ORIGIN: Ankarafa, Madagascar

ref:TIgr1765c 

 

       Enlarge 27.06 cts. sphene crystal green. single 

 33.9 x 15.5 x 5.6 mm. ( Transparent )

The SPHENE crystal is externally undamaged.

stone PRICE  

USD 320.00 

ORIGIN: Ankarafa, Madagascar

ref:TIgr2706c 

 

       Enlarge 39.90 cts. sphene crystal green. single 

 33.1 x 18 x 9.8 mm. ( Transparent )

The SPHENE crystal is externally undamaged.

stone PRICE  

USD 389.00 

ORIGIN: Ankarafa, Madagascar

ref:TIgr3990c 

 

         Enlarge  32.62 cts. sphene crystal green. single 

 27.1 x 25.7mm. ( Transparent )

The SPHENE crystal is externally undamaged.

stone PRICE  

USD 300.00 

ORIGIN: Ankarafa, Madagascar

ref:TIgr6g 

 

   Enlarge 11.89 cts. sphene crystal green. single 

 28.2 x 15.8 x 3.4 mm. ( Transparent )

The SPHENE crystal is externally undamaged.

stone PRICE  

USD 114.00 

ORIGIN: Ankarafa, Madagascar

ref:TIgr1189c 

 

     Enlarge  14.50 cts. sphene crystal green. single 

 23.5 x 15 x 5.7 mm. ( Transparent )

The SPHENE crystal is externally undamaged.

stone PRICE  

USD 145.00 

ORIGIN: Ankarafa, Madagascar

ref:TIgr1450c 

 

      Enlarge 15.93 cts. sphene crystal green. single 

 25.7 x 15 x 5 mm. ( Transparent )

The SPHENE crystal is externally undamaged.

stone PRICE  

USD 135.00 

ORIGIN: Ankarafa, Madagascar

ref:TIgr1593c 

 

   Enlarge  12gr. sphene crystal green. single 

 43  x 10.1 x 19.4  mm. ( Glossy )

The SPHENE crystal is externally undamaged.

stone PRICE  

 SOLD 

ORIGIN: Ankarafa, Madagascar

ref:TIgr12g 

 

   34.70 cts. sphene crystal green. single 

 35 x 11.7 x 14.6 mm. ( Glossy )

The SPHENE crystal is externally undamaged.

stone PRICE  

USD 220.00 

ORIGIN: Ankarafa, Madagascar

ref:TIgr3470 

 

  

The SPHENE crystal is externally undamaged.

22 gr. sphene crystal green. single ( Titanite )

49.5 x 31.4 mm.

stone PRICE  

 SOLD 

ORIGIN: Ankarafa, Madagascar

ref:TIgr22g 

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Next page    SPHENE 2 SPHENE FACET 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.)

The SPHENE crystals are externally undamaged.

ORIGIN: Ankarafa, Madagascar

 

                                   Enlarge

Image by A. Darbellay
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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