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| Scorodite
is named from the Greek word skorodon, for garlic,
in allusion to its arsenic odor when heated.
| Discovered
in 1817;
IMA
status: Valid (pre-IMA; Grandfathered) |
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Chemistry
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Chemical
Formula: |
Fe3+AsO4•2H2O
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Hydrated
Iron Arsenate |
Molecular
Weight: |
230.80. gm |
Composition: |
Iron |
24.20 % |
Fe |
34.60 % |
Fe2O3 |
|
Arsenic |
32.46 % |
As |
49.79 % |
As2O5 |
|
Hydrogen |
1.75 % |
H |
15.61 % |
H2O |
|
Oxygen |
41.59 % |
O |
|
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|
|
100.00 % |
|
100.00 % |
= TOTAL OXIDE |
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Classification
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Mineral
Classification: |
Phosphates
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Strunz 8th
Ed. ID:
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7/C.09-80
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Nickel-Strunz 10th
Ed. ID:
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8.CD.10
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8 : PHOSPHATES, ARSENATES, VANADATES C : Phosphates
without additional anions, with H2O D : With only
medium-sized cations, RO4:H2O = 1:2
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Related
to: |
Variscite
Group, Scorodite-Yanomamite Series, Scorodite-Mansfieldite
Series, Scorodite-Strengite Series.
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Varieties: |
Aluminian
Scorodite, Phosphoscorodite
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Synonyms: |
Arsenic
Sinter, Cupreous Arsenate of Iron, Cupromartial Arsenate,
Loaisite, Martial Arsenate of Copper
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Crystal
Data
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Crystallography:
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Orthorhombic
- Dipyramidal
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Crystal
Habit:
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Crystals
pyramidal {111}, tabular [001], or prismatic [010],
with large {111}, {101}, {201}, {001}, many other modifying
forms, to 5 cm. Commonly as crystalline crusts; may
be porous, sinterlike, earthy, massive.
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Twinning:
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None
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Physical
Properties
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Cleavage: |
{201} Imperfect, {100} Poor, {001} Poor
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Fracture: |
Sub-Conchoidal,
Splintery
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Tenacity:
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Brittle
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Moh's
Hardness: |
3.5
- 4.0
|
Density:
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3.27 (g/cm3)
|
Luminescence:
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None
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Radioactivity:
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Not
Radioactive
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Other: |
Soluble in acids; decomposed in strong alkalies.
Alters to limonite.
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Optical
Properties
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Color: |
Pale
leek-green, grayish green, liver-brown, pale blue, violet,
yellow, pale grayish, colorless; may be blue-green in
daylight but bluish purple to grayish blue in incandescent
light; in transmitted light, colorless to pale shades
of green or brown.
|
Transparency: |
Translucent to
Semi-Transparent
|
Luster: |
Vitreous
to Subadamantine, Subresinous
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Refractive
Index: |
1.741
- 1.820 Biaxial ( + )
|
Birefringence: |
0.027
- 0.036
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Dispersion: |
Relatively
Strong; r > v
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Pleochroism: |
Weak,
typically faint; blue-violet to blue-green
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Occurances
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Geological
Setting: |
A
secondary mineral formed by oxidation of As-bearing
sulfides. |
Common
Associations: |
Pharmacosiderite,
Beudantite, Carminite, Dussertite, Arseniosiderite,
Adamite, Austinite, Vivianite, iron oxides |
Common
Impurities: |
Al
|
Type
Locality: |
Stamm Asser Mine, Graul,
Langenberg, Schwarzenberg District, Erzgebirge, Saxony, Germany |
Year
Discovered: |
1817
|
View
mineral photos: |
Scorodite
Mineral Photos and Locations |
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More
Information
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|
Mindat.org
Webmineral.com
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Scorodite
is not a rare mineral, but is very rare as a faceted
gem. Gems are very small since gem quality crystals
are typically very small. Scorodite gems may also rarely
display a color change from green to violet under different
types of light.
There
are numerous occurrences of Scorodite, typically in
small amounts. Some localities for well-crystallized
material are: in Germany, from Schwarzenberg, Saxony,
and in the Clara mine, near Oberwolfach, Black Forest.
At Horní Slavkov (Schlaggenwald), Czech Republic. From
Lölling, Carinthia, Austria. Found at a number of places
in Gwennap, Calstock, and elsewhere in Cornwall, England.
Occurs at Djebel Debar, Qacentina (Constantine), Algeria.
Very large crystals from Tsumeb, Namibia. Large crystals
from Antonio Pereira, Minas Gerais, Brazil. In Mexico,
large crystals from the El Cobre mine, Aranzazú, Concepcíon
del Oro, Zacatecas, and in the Ojuela mine, Mapimí,
Durango. In the USA, in Utah, an ore mineral at Gold
Hill, Tooele County, and in the Tintic district, Juab
County; and from the Majuba Hill mine, Antelope district,
Pershing County, Nevada. At the Kiura mine, Oita Prefecture,
Japan, large crystals. From Broken Hill, New South Wales,
Australia.
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