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| Facet | ||
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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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| Cab. | ||
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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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| Next page »» SPHENE 2 ¦ SPHENE FACET ¦ BROWN SPHENE/SCAPOLITE | 
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30
grms.
sphene crystal green. single
43.9 x 41.7mm. ( Transparent ) The SPHENE crystal is externally slightly damaged. |
stone PRICE
USD Enquire ORIGIN: Ankarafa, Madagascar
ref:TIgr30gr
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72.92
cts.
sphene crystal green. single
40.8 x 31 mm. ( Transparent ) The SPHENE crystal is externally undamaged. |
stone PRICE
USD 290.00 ORIGIN: Ankarafa, Madagascar
ref:TIgr14g
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32.62
cts.
sphene crystal green. single
27.1 x 25.7mm. ( Transparent ) The SPHENE crystal is externally undamaged. |
stone PRICE
USD 149.00 ORIGIN: Ankarafa, Madagascar
ref:TIgr6g
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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 54.00 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 75.00 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 68.00 ORIGIN: Ankarafa, Madagascar
ref:TIgr1593c
|
Enlarge
|
18.39
cts.
sphene crystal green. single
21.1 x 13.7 x 8.4 mm. ( Transparent ) The SPHENE crystal is externally undamaged. |
stone PRICE
USD 89.00 ORIGIN: Ankarafa, Madagascar
ref:TIgr1839c
|
Enlarge
|
12gr.
sphene crystal green. single
43 x 10.1 x 19.4 mm. ( Glossy ) The SPHENE crystal is externally undamaged. |
stone PRICE
USD 280.00 ORIGIN: Ankarafa, Madagascar
ref:TIgr12g
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6
gr.
sphene crystal green. single
35 x 11.7 x 14.6 mm. ( Glossy ) The SPHENE crystal is externally undamaged. |
stone PRICE
USD 140.00 ORIGIN: Ankarafa, Madagascar
ref:TIgr6g
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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
|
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
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© Image by A. Darbellay |
 |
«« Click on the picture to go to facet Sphene. |
| 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 = 119.716ø 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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