SPHENE                                NATURAL COLOR                                 Hardness  5 - 5.5
SPHENE AAA SPHENE 1 Greenish-yellow SPHENE ORANGE-BROWN SPHENE   Titanite Article
   Enlarge 15.30 cts. sphene oval green-yelow. single 

 18.1 x 12.6 mm. Depth: 8.2 mm.

Eye clean. Enhancement: none (N) Untreated

stone PRICE  

USD 8590.00 

ORIGIN: Madagascar

ref:TIgo 1530 

 

  Enlarge 12.82 cts. sphene oval yellow-green. single 

 18.4 x 12.3 mm. Depth : 7.4 mm.

Almost loupe clean. Enhancement: none (N) Untreated

stone PRICE

USD 8120.00 

ORIGIN: Madagascar

ref:TIyo 1282 

 

   Enlarge 38.91 cts. sphene emerald cut  brown cola. single 

 25.9 x 14 mm. Depth:10 mm. (rare)

Slightly included. Enhancement: none (N) Untreated

stone PRICE  

USD 12768.00 

ORIGIN: Madagascar

ref:TIbe 3891 

 

   Enlarge 43.73 cts. sphene oval brown cola. single 

 32 x 16.6 mm. Depth:9.2 mm (rare) giant sphene

Slightly included. Enhancement: none (N) Untreated

stone PRICE  

USD 15560.00 

ORIGIN: Madagascar

ref:TIbe 4373 

 

   Enlarge 51.57 cts. sphene oval yellow-green. single 

 33.3 x 19.5 X 9.2 mm. giant sphene

Eye clean. Enhancement: none (N) Untreated

stone PRICE  

USD 28779.00 

ORIGIN: Madagascar

ref:TIyo 5157 

 

   Enlarge 26.64 cts. sphene asymmetric whistle yellow-green. single 

 30.5 x 14.2 mm. Depth: 9.3 mm.

Almost loupe clean. Enhancement: none (N) Untreated

stone PRICE  

USD 19320.00 

ORIGIN: Madagascar

ref:TIga 2664 

 

Enlarge   22.34 cts. sphene calf's head cut yellow-green. single 

 19.8 x 21.2 mm. Depth:8.1 mm 

Almost loupe clean. Enhancement: none (N)

stone PRICE  

USD 6490.00 

ORIGIN: Madagascar

ref:TIgc 2234 

 

Enlarge   13.37 cts. sphene oval yellow-green. single 

 16.1 x 14.7 mm. Depth: 7.6 mm 

Almost loupe clean. Enhancement: none (N) Untreated

stone PRICE  

USD 4422.00 

ORIGIN: Madagascar

ref:TIyo 1337 

 

  Enlarge   12.03 cts. sphene kite cut yellow-green.  single 

 21.5 x 14 mm. Depth:8.9 mm.

Almost eye clean. Enhancement: none (N)

stone PRICE  

USD 5380.00 

ORIGIN: Madagascar

ref:TIya1203  

 

  Enlarge  15.70 cts. sphene oval yellow-brown.  single 

 18.2 x 13.5 mm. Depth: 8.9 mm. (With orange sparkles)

Moderately includedEnhancement: none (N) Untreated

stone PRICE

USD 3383.00 

ORIGIN: Madagascar

ref:TIbo 1570 

 

Enlarge   18.74 cts. sphene oval yellow-green. single 

 19.7 x 15.2 x 8.5 mm.

Almost loupe clean. Enhancement: none (N)

stone PRICE  

USD 11890.00 

ORIGIN: Madagascar

ref:TIyo 1874 

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Back to page    SPHENE AAA SPHENE 1 Greenish-yellow SPHENE CABOCHON ORANGE-BROWN SPHENE SPHENE CRYSTAL

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
SPHENE AAA SPHENE 1 Greenish-yellow SPHENE ORANGE-BROWN SPHENE
 
 
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