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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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| 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 |
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| ORTHOCLASE NATURAL COLOR Hardness 6 |
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| Next pages »» ORTHOCLASE 2 ¦ ORTHOCLASE FACET ¦ | 
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44.68
cts. yellow orthoclase crystal single
20.3 x 20.9 mm. Top crystal. Enhancement: none (N) |
stone PRICE
SOLD ORIGIN: Itrongay, Madagascar
ref:Oyr4468
|
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24.62
cts yellow orthoclase crystal single
21.3 x 14.4 mm. Top crystal. Enhancement: none (N) |
stone PRICE
USD 59.00 ORIGIN: Itrongay, Madagascar
ref:Oyr2462
|
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16
grms. yellow orthoclase crystal single
30.5 x 30.1 mm. Top crystal. Enhancement: none (N) |
stone PRICE
USD 192.00 ORIGIN: Itrongay, Madagascar
ref:Oyr1600g
|
Enlarge |
113.5
grms. yellow orthoclase crystal single
77.7 x 35.3 mm. Top crystal. Enhancement: none (N) |
stone PRICE
SOLD ORIGIN: Itrongay, Madagascar
ref:Oyr113.5gr
|
Enlarge |
60
grms. yellow orthoclase crystal single
50.6 x 28.2 mm. Top crystal. Enhancement: none (N) |
stone PRICE
USD 850.00 ORIGIN: Itrongay, Madagascar
ref:Oyr60gr
|
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55.50
grms. yellow orthoclase crystal single
47.2 x 29 mm. Top crystal. Enhancement: none (N) |
stone PRICE
SOLD ORIGIN: Itrongay, Madagascar
ref:Oyr5550g
|
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25.80
grms. yellow orthoclase crystal single
31 x 25.2 mm. Top crystal. Enhancement: none (N) |
stone PRICE
USD 362.00 ORIGIN: Itrongay, Madagascar
ref:Oyr2580g
|
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143
grms. yellow orthoclase crystal single
56 x 50.5 mm. Top crystal. Enhancement: none (N) |
stone PRICE
USD 2424.00 ORIGIN: Itrongay, Madagascar
ref:Oyr14300g
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| Next pages »» ORTHOCLASE 2 ¦ ORTHOCLASE AFFORDABLE ¦ ORTHOCLASE FACET ¦ | |
General Information |
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| Chemical Formula: | KAlSi3O8 | |||
| Composition: | Molecular Weight = 278.33 gm | |||
| Potassium 14.05 % K 16.92 % K2O | ||||
| Aluminium 9.69 % Al 18.32 % Al2O3 | ||||
| Silicon 30.27 % Si 64.76 % SiO2 | ||||
| Oxygen 45.99 % O | ||||
| ______ ______ | ||||
| 100.00 % 100.00 % = TOTAL OxIDE | ||||
| Empirical Formula: | KAlSi3O8 | |||
| Environment: | Intrusive and extrusive igneous, and metamorphic rocks. | |||
| IMA Status: | Approved IMA 1960 | |||
| Locality: | Common world wide occurrences. Madagascar | |||
| Name Origin: | From the Greek orthos - "right" and kalo -" I cleave" in allusion to the mineral's right angle of good cleavage. | |||
| Synonym: | Adularia | |||
| Orthose | ||||
Orthoclase Images |
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| Faceted orthoclase |
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Click on the picture to go to
faceted orthoclase
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| © Image by A. Darbellay | ||||
Crystallography |
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| Axial Ratios: | a:b:c =0.6636:1:0.5534 | |||
| Cell Dimensions: | a = 8.625, b = 12.996, c = 7.193, Z = 4; beta = 116.016ø V = 724.57 Den(Calc)= 2.55 | |||
| Crystal System: | Monoclinic-Prismatic H-M Symbol (2/m) Space Group: C2/m | |||
| x Ray Diffraction: | By Intensity(I/Io): 3.18(1)4.02(0.9) 3.8(0.8) | |||
Physical Properties |
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| Cleavage: | [001] Perfect, [010] Good | |||
| Color: | colorless, greenish, grayish yellow, white, or pink. | |||
| Density: | 2.56 | |||
| Diaphaniety: | Transparent to translucent | |||
| Fracture: | Uneven - Flat surfaces (not cleavage) fractured in an uneven pattern. | |||
| Habits: | Prismatic - Crystals Shaped like Slender Prisms (e.g. tourmaline)., Massive - Granular - Common texture observed in granite and other igneous rock., Blocky - Crystal shape tends to be equant (e.g. feldspars). | |||
| Hardness: | 6 - Orthoclase | |||
| Luminescence: | None. | |||
| Luster: | Vitreous (Glassy) | |||
| Streak: | white | |||
Optical Properties |
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| Optical Data: | Biaxial (-), a=1.518, b=1.522, g=1.523-1.524, bire=0.0050-0.0060, 2V(Calc)=52-70, 2V(Meas)=65-75. Dispersion relatively strong. | |||
| Pleochroism (x): | colorless. | |||
| Pleochroism (y): | colorless. | |||
| Pleochroism (z): | colorless. | |||
Classification |
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| Dana Class: | Tectosilicate Al-Si Framework | |||
| with Al-Si frameworks | ||||
| (Na,Ba) feldspars | ||||
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| Celsian BaAl2Si2O8 I21/c 2/m | ||||
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| Strunz Class: | Silicates | |||
| ectosilicates (network) without anions unfamiliar to the tetraheders | ||||
| STRUNZ - Silicates [Tectosilicates (network) without anions unfamiliar to the tetraheders {Feldspar group, Buddingtonite - Orthocl | ||||
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| Microcline KAlSi3O8 C1- -1 | ||||
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| Next pages »» ORTHOCLASE 2 ¦ ORTHOCLASE AFFORDABLE ¦ ORTHOCLASE FACET ¦ |
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