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| SPHENE NATURAL COLOR Hardness 5 - 5.5 |
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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. |
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 |
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 included. Enhancement: 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 |
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| 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 |
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Crystallography |
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| 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 |
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| 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 |
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| 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 |
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| Dana Class: | Nesosilicate Insular SiO4 Groups and O, OH, F, and H2O | ||
| with cations in [6] and/or > [6] coordination | |||
| Titanite group | |||
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| 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 | |||
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| Vanadomalayaite CaVOSiO4 C2/c 2/m | |||
| Malayaite CaSnSiO5=CaSnOSiO4 A2/a 2/m | |||
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| SPHENE AAA ¦ SPHENE 1 ¦ Greenish-yellow SPHENE ¦ ORANGE-BROWN SPHENE ¦ | |
