Hoperanchite
A valid IMA mineral species
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About Hoperanchite
Formula:
(NH4)2(S2O3)
Colour:
colorless
Lustre:
Vitreous
Hardness:
2½
Specific Gravity:
1.68
Crystal System:
Monoclinic
Name:
For the type locality
Type Locality:
Hoperanchite is the first thiosulfate mineral that does not contain essential Pb.
New structure type
New structure type
Unique Identifiers
Mindat ID:
471237
Long-form identifier:
mindat:1:1:471237:0
IMA Classification of Hoperanchite
Approved
IMA Formula:
(N3-H4)2(S6+O3S2-)
Classification of Hoperanchite
7.J0.
7 : SULFATES (selenates, tellurates, chromates, molybdates, wolframates)
J : Thiosulfates
0 :
7 : SULFATES (selenates, tellurates, chromates, molybdates, wolframates)
J : Thiosulfates
0 :
Mineral Symbols
As of 2021 there are now IMA–CNMNC approved mineral symbols (abbreviations) for each mineral species, useful for tables and diagrams.
| Symbol | Source | Reference for Standard |
|---|---|---|
| Hpr | IMA–CNMNC | Warr, L.N. (2021). IMA–CNMNC approved mineral symbols. Mineralogical Magazine, 85(3), 291-320. doi:10.1180/mgm.2021.43 |
Physical Properties of Hoperanchite
Vitreous
Transparency:
Transparent
Colour:
Colorless
Streak:
White
Hardness:
2½ on Mohs scale
Tenacity:
Brittle
Cleavage:
Distinct/Good
good cleavage on {001}.
good cleavage on {001}.
Fracture:
Irregular/Uneven
Density:
1.68(2) g/cm3 (Measured) 1.650 g/cm3 (Calculated)
Optical Data of Hoperanchite
Type:
Biaxial (+)
RI values:
nα = 1.602(2) nβ = 1.616(2) nγ = 1.634(2)
2V:
Measured: 84° (2)
Max. Birefringence:
δ = 0.032
Based on recorded range of RI values above.
Based on recorded range of RI values above.
Interference Colours:
The colours simulate birefringence patterns seen in thin section under crossed polars. They do not take into account mineral colouration or opacity.
Michel-Levy Bar The default colours simulate the birefringence range for a 30 µm thin-section thickness. Adjust the slider to simulate a different thickness.
Grain Simulation You can rotate the grain simulation to show how this range might look as you rotated a sample under crossed polars. Each grain retains its interference colour (retardation) while its brightness falls to black at extinction and reaches a maximum between extinction positions.
The colours simulate birefringence patterns seen in thin section under crossed polars. They do not take into account mineral colouration or opacity.
Michel-Levy Bar The default colours simulate the birefringence range for a 30 µm thin-section thickness. Adjust the slider to simulate a different thickness.
Grain Simulation You can rotate the grain simulation to show how this range might look as you rotated a sample under crossed polars. Each grain retains its interference colour (retardation) while its brightness falls to black at extinction and reaches a maximum between extinction positions.
Surface Relief:
Moderate
Orientation:
Y = b, X ^ a = 20° in obtuse β
Pleochroism:
Non-pleochroic
Chemistry of Hoperanchite
Mindat Formula:
(NH4)2(S2O3)
Element Weights:
Elements listed:
Crystallography of Hoperanchite
Crystal System:
Monoclinic
Class (H-M):
2 - Sphenoidal
Space Group:
B2
Setting:
C2
Cell Parameters:
a = 10.2313(5) Å, b = 6.4998(3) Å, c = 8.8098(6) Å
β = 94.661(7)°
β = 94.661(7)°
Ratio:
a:b:c = 1.574 : 1 : 1.355
Unit Cell V:
583.93 ų (Calculated from Unit Cell)
Z:
4
X-Ray Powder Diffraction
Powder Diffraction Data:
| d-spacing | Intensity |
|---|---|
| 5.112 Å | (45) |
| 4.730 Å | (100) |
| 4.547 Å | (89) |
| 4.345 Å | (39) |
| 3.225 Å | (34) |
| 3.021 Å | (89) |
| 2.627 Å | (86) |
| 2.380 Å | (25) |
Type Occurrence of Hoperanchite
General Appearance of Type Material:
random intergrowths of colorless tablets, commonly with rounded outlines, up to about 0.3 mm in diameter
Place of Conservation of Type Material:
Cotype material is deposited in the collections of the Natural History Museum of Los Angeles County, 900 Exposition Boulevard, Los Angeles, CA 90007, USA, catalogue number numbers 76339, 76340, and 76341
Geological Setting of Type Material:
In a burning bituminous shale
Associated Minerals at Type Locality:
Other Language Names for Hoperanchite
Dutch:Hoperanchiet
German:Hoperanchit
Fluorescence of Hoperanchite
none
Other Information
Notes:
The mineral dissolves instantly in room temperature H2O.
Health Risks:
No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.
Internet Links for Hoperanchite
mindat.org URL:
https://www.mindat.org/min-471237.html
Please feel free to link to this page.
Please feel free to link to this page.
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External Links:
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References for Hoperanchite
Reference List:
Localities for Hoperanchite
Showing 1 localities.
symbol to view information about a locality.
The Locality List
- This locality has map coordinates listed.
- This locality has estimated coordinates.
ⓘ - Click for references and further information on this occurrence.
? - Indicates mineral may be doubtful at this locality.
- Good crystals or important locality for species.
- World class for species or very significant.
(TL) - Type Locality for a valid mineral species.
(FRL) - First Recorded Locality for everything else (eg varieties).
All localities listed without proper references should be considered as questionable.
USA (TL) | |
| Kampf +1 other reference |
Hope Ranch [2], Santa Barbara County, California, USA