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| Amethyst | ||
| Apatite | ||
| Aquamari | ||
| Beryl | ||
| Citrine | ||
| Danburite | ||
| Emerald | ||
| Hessonite | ||
| Malaya | ||
| Rhodolite | ||
| Spessart. | ||
| Hambergi | ||
| Iolite | ||
| Orthoclas | ||
| Phenakit | ||
| Quartz | ||
| Ruby | ||
| Sapphire | ||
| Sa. Fancy | ||
| Sa. Pink | ||
| Sa.Sunset | ||
| Sphene | ||
| Topaz | ||
| Tourmalin | ||
| Bi-color | ||
| Chrome | ||
| Green | ||
| Peach | ||
| Pink | ||
| Rubellite | ||
| Yellow | ||
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| Aquamar | ||
| Amethyst | ||
| Emerald | ||
| Hessonite | ||
| Iolite | ||
| Labrador | ||
| Quartz | ||
| Quartz bl. | ||
| Rhodolite | ||
| Ruby | ||
| Spessart. | ||
| Sap.Slice | ||
| Sapp.Star | ||
| Tourmalin | ||
| Cat's eye | ||
| Green | ||
| Pink | ||
| Peach | ||
| Polychro. | ||
| Rubellite | ||
| Slice | ||
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G e n u i n e G e m s |
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| 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 INFO. DE TRACK ORDERS |
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| SPHENE NATURAL COLOR Hardness 5 - 5.5 |
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| SPHENE AAA ¦ SPHENE 1 ¦ SPHENE affordable price ¦ |  |
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15.27
cts.
sphene oval green-yelow. single
18.1 x 12.6 mm. Eye clean. Enhancement: none (N) Untreated |
stone PRICE
USD 3054.00 ORIGIN: Madagascar
ref:TIgo 1527
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38.91
cts.
sphene emerald cut brown cola. single
25.9 x 14 mm. (rare) Slightly included. Enhancement: none (N) Untreated |
stone PRICE
USD 7768.00 ORIGIN: Madagascar
ref:TIbe 3891
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43.73
cts.
sphene oval brown cola. single
32 x 16.6 mm. (rare) giant sphene Slightly included. Enhancement: none (N) Untreated |
stone PRICE
USD 7860.00 ORIGIN: Madagascar ref:TIbe
4373
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51.57
cts.
sphene oval yellow-green. single
33.3 x 19.5 mm. giant sphene Eye clean. Enhancement: none (N) Untreated |
stone PRICE
USD 9779.00 ORIGIN: Madagascar
ref:TIyo 5157
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26.60
cts.
sphene asymmetric trapeze yellow-green. single
30.5 x 14.2 mm. Almost loupe clean. Enhancement: none (N) Untreated |
stone PRICE
USD 5320.00 ORIGIN: Madagascar
ref:TIga 2660
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22.34
cts.
sphene calf's head cut yellow-green. single
19.8 x 21.2 mm. Almost loupe clean. Enhancement: none (N) |
stone PRICE
USD 3990.00 ORIGIN: Madagascar
ref:TIgc 2234
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13.36
cts.
sphene oval yellow-green. single
16.1 x 14.7 mm. Almost loupe clean. Enhancement: none (N) Untreated |
stone PRICE
USD 2672.00 ORIGIN: Madagascar
ref:TIyo 1336
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12.03
cts.
sphene kite cut yellow-green. single
21.5 x 14 mm. Almost eye clean. Enhancement: none (N) |
stone PRICE
USD 2280.00 ORIGIN: Madagascar ref:TIya1203
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7.24
cts.
sphene pear green-yelow. single
15.5 x 10.9 mm. (S.u.g.f. cut) Moderately included. Enhancement: none (N) |
stone PRICE
USD 699.00 ORIGIN: Madagascar
ref:TIgo 724
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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 3590 .00 ORIGIN: Madagascar
ref:TIyo 1874
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| Back to page »» SPHENE AAA ¦ SPHENE 1 ¦ SPHENE affordable price ¦ CABOCHON ¦ | |
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 ¦ SPHENE affordable price ¦ | |
