Services     SINGLE STONES            PAIRS                     SETS                CABOCHONS         COLLECTOR'S       DESIGNER'S    
 Site map          WELCOME          ORDER TERMS           MINERALS                RESERVE           CONTACT US          ABOUT US    
                 Usually ships within 24 hours           SEARCH FORM          HELP    INFO. FR      TRACK ORDERS
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  

 SOLD 

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 

Enlarge

To purchase a stone from this site click to ORDER

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
 
 
Will ship Worldwide
  Green Verdict Image
© 1987 - 2023  gggems.com  All rights reserved.