Parasymplesite (original) (raw)
A valid IMA mineral species - grandfathered
About ParasymplesiteHide
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Formula:
Fe2+3(AsO4)2 · 8H2O
Colour:
Light green to leek green, may be greenish black, also deep blue
Lustre:
Sub-Vitreous, Resinous, Waxy, Silky
Crystal System:
Monoclinic
Name:
Named by Tei-ichi Ito, Hideo Minato, and Kin-ichi Sakurai in 1954 from the Greek παρα = beyond for the polymorphic relationship to symplesite.
Unique IdentifiersHide
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Long-form identifier:
mindat:1:1:3114:7
33083ce1-c849-4105-a895-ca1e37735db4
IMA Classification of ParasymplesiteHide
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Approved, 'Grandfathered' (first described prior to 1959)
IMA Formula:
Fe2+3(AsO4)2 · 8H2O
Type description reference:
Classification of ParasymplesiteHide
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8.CE.40
8 : PHOSPHATES, ARSENATES, VANADATES
C : Phosphates without additional anions, with H2O
E : With only medium-sized cations, RO4:H2O about 1:2.5
40.3.6.6
40 : HYDRATED NORMAL PHOSPHATES,ARSENATES AND VANADATES
3 : A3(XO4)2·xH2O
20.9.7
20 : Arsenates (also arsenates with phosphate, but without other anions)
9 : Arsenates of Fe
Mineral SymbolsHide
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As of 2021 there are now IMA–CNMNC approved mineral symbols (abbreviations) for each mineral species, useful for tables and diagrams.
| Symbol | Source | Reference |
|---|---|---|
| Psym | 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 ParasymplesiteHide
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Sub-Vitreous, Resinous, Waxy, Silky
Transparency:
Transparent, Translucent
Colour:
Light green to leek green, may be greenish black, also deep blue
Translation gliding:
T {110}, t {001}
Density:
3.01 g/cm3 (Measured) 3.043 g/cm3 (Calculated)
Optical Data of ParasymplesiteHide
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RI values:
_n_α = 1.628 - 1.635 _n_β = 1.660 - 1.668 _n_γ = 1.702 - 1.705
δ = 0.074
Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.
Dispersion:
r>v weak to distinct
Optical Extinction:
X = b, Z ∧ c = 29.0-31.5°
Comments:
Weak to strong; X = deep blue to bluish green, Y = nearly colorless to yellowish, Z = colorless to brownish yellow.
Comments:
Absorption: X > Y = Z (Sturmann 1976)
Chemistry of ParasymplesiteHide
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Mindat Formula:
Fe2+3(AsO4)2 · 8H2O
Crystallography of ParasymplesiteHide
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Crystal System:
Monoclinic
Class (H-M):
2/m - Prismatic
Cell Parameters:
a = 10.3519(10) Å, b = 13.6009(13) Å, c = 4.7998(4) Å
β = 104.816(2)°
Ratio:
a:b:c = 0.761 : 1 : 0.353
Unit Cell V:
653.32 ų (Calculated from Unit Cell)
Morphology:
Type material:
Thick tabular after (010), with large (010) and (201) or stout-prismatic with (110) and other prisms nearly equally well developed and with relatively large (502). Numerous prismatic faces are observed in both types of crystals, other kinds of faces being only occasionally noticed.
Comment:
Cell parameters from Hongu et al. (2021).
Crystal StructureHide
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| ID | Species | Reference | Link | Year | Locality | Pressure (GPa) | Temp (K) |
|---|---|---|---|---|---|---|---|
| 0009137 | Parasymplesite | Mori H, Ito T (1950) The structure of vivianite and symplesite Acta Crystallographica 3 1-6 |  |
1950 | Kiura, Japan | 0 | 293 |
CIF Raw Data - click here to close
X-Ray Powder DiffractionHide
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Powder Diffraction Data:
| d-spacing | Intensity |
|---|---|
| 8.057 Å | (30) |
| 6.750 Å | (100) |
| 5.005 Å | (10) |
| 4.612 Å | (5) |
| 4.430 Å | (20) |
| 4.105 Å | (5) |
| 4.029 Å | (5) |
| 3.941 Å | (10) |
| 3.183 Å | (5) |
| 3.694 Å | (10) |
| 3.388 Å | (5) |
| 3.247 Å | (30) |
| 3.025 Å | (50) |
| 2.797 Å | (5) |
| 2.761 Å | (30) |
| 2.735 Å | (30) |
| 2.679 Å | (20) |
| 2.602 Å | (5) |
| 2.571 Å | (10) |
| 2.482 Å | (20) |
| 2.343 Å | (20) |
| 2.317 Å | (10) |
| 2.254 Å | (5) |
| 2.214 Å | (10) |
| 2.102 Å | (20) |
| 2.025 Å | (5) |
| 2.001 Å | (5) |
| 1.964 Å | (5) |
| 1.932 Å | (10) |
| 1.854 Å | (5) |
| 1.808 Å | (5) |
| 1.789 Å | (5) |
| 1.694 Å | (20) |
| 1.674 Å | (20b) |
Comments:
ICDD 35-461. Alternate pattern: 7.91 (70), 6.68 (100), 4.41 (40), 3.91 (30), 3.24 (50), 3.01 (90), 2.75 (50), 2.47 (40), BM 100:310
Geological EnvironmentHide
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Type Occurrence of ParasymplesiteHide
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General Appearance of Type Material:
Radiating aggregates of fine crystals. Crystals to 3 x 1.5 x 1 mm.
Place of Conservation of Type Material:
National Science Museum, Tokyo, Japan, M24052.
Geological Setting of Type Material:
Oxidized polymetallic veins. Contact zone of limestone with granitic diorite.
Reference:
Ito, T.-I., Minato, H., Sakurai, K.-I. (1954): Parasymplesite, a New Mineral Polymorphous with Symplesite. Proceedings of the Japan Academy, 30, 318-324.
Other Language Names for ParasymplesiteHide
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Varieties of ParasymplesiteHide
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Relationship of Parasymplesite to other SpeciesHide
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Other Members of this group:
Common AssociatesHide
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Associated Minerals Based on Photo Data:
Related Minerals - Strunz-mindat GroupingHide
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Fluorescence of ParasymplesiteHide
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Other InformationHide
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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 ParasymplesiteHide
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References for ParasymplesiteHide
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Reference List:
Yoshiasa, Akira, Miyano, Yumiko, Isobe, Hiroshi, Sugiyama, Kazumasa, Arima, Hiroshi, Nakatsuka, Akihiko, Momma, Koichi, Miyawaki, Ritsuro (2016) Structural refinement of köttigite–parasymplesite solid solution: Unique cation site occupancy and chemical bonding with water molecules. Journal of Mineralogical and Petrological Sciences, 111 (5) 363-369 doi:10.2465/jmps.151207
HONGU, Hidetomo, YOSHIASA, Akira, KITAHARA, Ginga, MIYANO, Yumiko, HAN, Karin, MOMMA, Koichi, MIYAWAKI, Ritsuro, TOKUDA, Makoto, SUGIYAMA, Kazumasa (2021) Crystal structure refinement and crystal chemistry of parasymplesite and vivianite. Journal of Mineralogical and Petrological Sciences, 116 (4) 183-192 doi:10.2465/jmps.200904
Localities for ParasymplesiteHide
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This map shows a selection of localities that have latitude and longitude coordinates recorded. Click on the 
symbol to view information about a locality. The symbol next to localities in the list can be used to jump to that position on the map.
Locality ListHide
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- 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). Struck out - Mineral was erroneously reported from this locality. Faded * - Never found at this locality but inferred to have existed at some point in the past (e.g. from pseudomorphs).
All localities listed without proper references should be considered as questionable.