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SPHENE                                NATURAL COLOR                                 Hardness  5 -
Next page  »»  SPHENE AAA ¦ SPHENE 10 - 51 CTS. ¦ Greenish-yellow SPHENE ¦ ORANGE-BROWN SPHENE ¦ Titanite Article
   Enlarge 10.14 cts. sphene oval green. single 

 15.6 x 12 mm. Depth: 6.9 mm.

Almost eye clean.  Enhancement: none (N) Untreated

stone PRICE

USD 3989.00 

ORIGIN: Madagascar

ref:TIgo 1014 

 

     Enlarge 4.16 cts. sphene oval green-yellow. single 

 11.7 x 9.4 mm. Depth: 5.5 mm  (S.u.g.f. cut)

Eye clean. Enhancement: none (N) Untreated

stone PRICE

USD 819.00 

ORIGIN: Madagascar

ref:TIyo 416 

 

     Enlarge 7.12 cts. sphene oval yellow. single 

  12.9 x 10.9 mm. Depth: 7.2 mm.

Loupe clean. Enhancement: none (N) Untreated

stone PRICE

USD 1592.00 

ORIGIN: Madagascar

ref:TIyo712 

 

 Enlarge  1.71 cts. sphene oval yellow-green. single 

 9.2 x 6 mm. Depth: 4.2 mm.  yellow sparkles

Eye clean.  Enhancement: none (N) Untreated

stone PRICE

USD 218.00 

ORIGIN: Madagascar

ref:TIyo171 

 

  Enlarge   9.92 cts. Chrome sphene trapeze green. single 

 23.5 x 6.1 mm. Depth : 5.1 mm.

Almost loupe clean. Enhancement: none (N) Untreated

stone PRICE

USD 3575.00 

ORIGIN: Madagascar

ref:TIga 992 

  

  Enlarge  5.90 cts. sphene oval Orange-yellow.  single 

 12.8 x 10 x 6.4 mm. ( With red sparkles )

Slightly included. Enhancement: none (N) Untreated

stone PRICE

USD 909.00 

ORIGIN: Madagascar

ref:TIbo590 

 

     Enlarge 4.14 cts. sphene oval green-yellow. single 

  11.2 x 8.6 mm. Depth: 5.8 mm (S.u.g.f. cut)

Slightly included. Enhancement: none (N) Untreated

stone PRICE

USD 545.00 

ORIGIN: Madagascar

ref:TIyo 414 

 

Enlarge    9.03 cts. sphene oval brown-orange. single 

15.1 x 12 mm. Depth: 6.9 mm.

Slightly included. Enhancement: none (N) Untreated

stone PRICE

USD 1780.00 

ORIGIN: Madagascar

ref:TIbo 903 

 

   Enlarge  5.79 cts. sphene emerald cut  yellow-green. single 

 13.3 x 8.2 mm. Depth: 6 mm.

Slightly included. Enhancement: none (N) Untreated

stone PRICE

USD 998.00 

ORIGIN: Madagascar

ref:TIye579  

 

   Enlarge 4.12 cts. sphene emerald cut. brown cola. single 

 10 x 8.5 mm. Depth: 5.8 mm.

Almost loupe clean.  Enhancement: none (N) Untreated

stone PRICE

 SOLD 

ORIGIN: Madagascar

ref:TIoe 412 

 

          Enlarge 3.34 cts. sphene oval yellow-green. round single 

 9.6  mm. Depth: 5.5 mm.

Slightly included. Enhancement: none (N) Untreated

stone PRICE

USD 450.00 

ORIGIN: Madagascar

ref:TIygr334

 

  Enlarge  3.45 cts. sphene round yellow-green. single 

10.4 mm. Depth: 5.2 mm. (A better looking stone than the picture.)

Almost eye clean.. Enhancement: none (N) Untreated

stone PRICE  

USD 489.00 

ORIGIN: Madagascar

ref:TIyr345

 

 Enlarge  3.60 cts. Chrome sphene pear green. single 

12.4 x 8.4 x 5.4 mm.

Slightly included. Enhancement: none (N) Untreated

stone PRICE  

USD 679.00 

ORIGIN: Madagascar

ref:TIgp360  

 

    Enlarge 4.91 cts. sphene oval yellow-green. pear single 

   12.2 x 9 x 6.9 mm.

Very slightly included.. Enhancement: none (N) Untreated

stone PRICE

USD 950.00 

ORIGIN: Madagascar

ref:TIygp491

 

   Enlarge 3.20 cts. sphene oval green-yellow. single 

 9.6 x 7.6 mm. Depth: 6 mm.  (S.u.g.f. cut)

Almost loupe clean. Enhancement: none (N) Untreated

stone PRICE

USD 840.00 

ORIGIN: Madagascar

ref:TIyo 320 

 

   Enlarge 2.41 cts. sphene oval yellow-green. single 

 9.7 x 6.8 mm. Depth: 4.8 mm. (S.u.g.f. cut)

Almost loupe clean. Enhancement: none (N) Untreated

stone PRICE

USD 285.00 

ORIGIN: Madagascar

ref:TIyo 241 

 

     Enlarge   1.95 cts. sphene oval yellow single 

 8.5 x 7 mm. Depth: 4.5 mm. (S.u.g.f. cut)

Very slightly included. Enhancement: none (N)

stone PRICE

USD 199.00 

ORIGIN: Madagascar

ref:TIyo 195

 

  Enlarge  7.24 cts. sphene pear green-yelow. single 

  15.5 x 10.9 mm. Depth: 6.8 mm. (S.u.g.f. cut)

Slightly included.  Enhancement: none (N)

stone PRICE  

USD 1119.00 

ORIGIN: Madagascar

ref:TIgp 724 

 

  Enlarge  5.56 cts. sphene pear yellow-green. single 

  15.7 x 14 mm. Depth: 5.7 mm.

Very slightly included. Enhancement: none (N)

stone PRICE

USD 995.00 

ORIGIN: Madagascar

ref:TIyp556

Next page  »»  SPHENE AAA ¦ SPHENE 10 - 51 CTS. ¦ 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
  Titanite Article  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.

     © Image by A. Darbellay

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 = 119.716ø 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 ¦
     Single upper girdle facet cut. (S.u.g.f. cut)                                         Ask a question
 
 
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