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Diameter, mm (1mm - 0,039inch)
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  2. Collectible minerals
  3. Orpiment

Collectible minerals - full range in stock "Orpiment"

Orpiment is a hydrothermal mineral that rarely forms large crystals. This mineral usually occurs as foliated, scaly, or granular aggregates. It is the main ore for arsenic. At the same time, fears about the poisonousness of orpiment are greatly exaggerated. Arsenic forms a stable compound in the mineral and begins to be released only when heated above 300 degrees. Orpiment is used for the production of mineral coloring pigment. Since the orpiment reserves far exceed the requirements for arsenic, this mineral often ends up in dumps.
You can see orpiment stone for sale and buy it in the Minerals of Russia online store.

Physical properties of Orpiment

General
Category Sulfide mineral
Formula
(repeating unit)		 As2S3
IMA symbol Orp
Strunz classification 2.FA.30
Crystal system Monoclinic
Crystal class Prismatic (2/m)
(same H-M symbol)
Space group P21/n
Unit cell a = 11.475(5), b = 9.577(4)
c = 4.256(2) [Å], β = 90.45(5)°; Z = 4
Identification
Color Lemon-yellow to golden or brownish yellow
Crystal habit Commonly in foliated columnar or fibrous aggregates; may be reniform or botryoidal; also granular or powdery; rarely as prismatic crystals
Twinning On {100}
Cleavage Perfect on {010}, imperfect on {100};
Tenacity Sectile
Mohs scale hardness 1.5–2
Luster Resinous, pearly on cleavage surface
Streak Pale lemon-yellow
Diaphaneity Transparent
Specific gravity 3.49
Optical properties Biaxial (−)
Refractive index nα = 2.400 nβ = 2.810 nγ = 3.020
Birefringence δ = 0.620
Pleochroism In reflected light, strong, white to pale gray with reddish tint; in transmitted light, Y = yellow, Z = greenish yellow
2V angle Measured: 30° to 76°, Calculated: 62°
Dispersion r > v, strong
Realgar, Orpiment
Code: 4847
Realgar, Orpiment
Sukhonkoe, Altai, RF
18*15*5mm

0.00 $ $13.33

Orpiment
Code: 4475
Orpiment
Menkyule, Yakutia, RF
35*14*9mm

0.00 $ $20.00

Realgar, Orpiment
Code: 4231
Realgar, Orpiment
Sukhonkoe, Altai, RF
28*21*4mm

0.00 $ $19.33

Orpiment
Code: 2464
Orpiment
Menkyule, Yakutia, RF
66*14*5mm

0.00 $ $25.00

Orpiment
Code: 1098
Orpiment
Menkyule, Yakutia, RF
61*38*12mm

0.00 $ $76.00

Orpiment
Code: 1101
Orpiment
Menkyule, Yakutia, RF
121*56*31mm

0.00 $ $433.00

Recommended
Orpiment
Code: 1839
Orpiment
Menkyule, Yakutia, RF
340*120*78 mm

0.00 $ $2 690.80

Orpiment
Code: 2252
Orpiment
Elbrus mine, Caucasus, RF
43*40*17mm

0.00 $ $50.00

Realgar, Orpiment archived
Code: 2777
Realgar, Orpiment
Sukhonkoe, Altai, RF
42*16*7mm

0.00 $ $16.33

Orpiment archived
Code: 2266
Orpiment
Menkyule, Yakutia, RF
38*18*13mm

0.00 $ $15.00

Realgar, Orpiment archived
Code: 1286
Realgar, Orpiment
Sukhonkoe, Altai, RF
51*39*17mm

0.00 $ $97.67

Realgar, Orpiment archived
Code: 2031
Realgar, Orpiment
Sukhonkoe, Altai, RF
23*13*8mm

0.00 $ $15.00

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