Magnesiokoritnigite
A valid IMA mineral species
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About Magnesiokoritnigite
Formula:
Mg(AsO3OH) · H2O
Colour:
Colourless to pale-pink
Lustre:
Vitreous
Hardness:
3
Specific Gravity:
2.95
Crystal System:
Triclinic
Member of:
Name:
The magnesium analogue of Koritnigite
Isostructural with:
This page provides mineralogical data about Magnesiokoritnigite.
Unique Identifiers
Mindat ID:
43924
Long-form identifier:
mindat:1:1:43924:4
IMA Classification of Magnesiokoritnigite
Approved
IMA Formula:
Mg(As5+O3OH)(H2O)
Approval year:
2013
First published:
2013
Classification of Magnesiokoritnigite
8.CB.20
8 : PHOSPHATES, ARSENATES, VANADATES
C : Phosphates without additional anions, with H2O
B : With only medium-sized cations, RO4:H2O = 1:1
8 : PHOSPHATES, ARSENATES, VANADATES
C : Phosphates without additional anions, with H2O
B : With only medium-sized cations, RO4:H2O = 1:1
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 |
|---|---|---|
| Mkor | 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 Magnesiokoritnigite
Vitreous
Transparency:
Transparent
Colour:
Colourless to pale-pink
Comment:
The crystals also occur in dense deep-pink intergrowths
Streak:
White
Hardness:
3 on Mohs scale
Comment:
~3
Tenacity:
Brittle
Cleavage:
Perfect
on {101}
on {101}
Fracture:
Conchoidal
Density:
2.95(3) g/cm3 (Measured) 2.935 g/cm3 (Calculated)
Optical Data of Magnesiokoritnigite
Type:
Biaxial (+)
RI values:
nα = 1.579(1) nβ = 1.586(1) nγ = 1.620(1)
2V:
Measured: 50° (2), Calculated: 50°
Max. Birefringence:
δ = 0.041
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 (positive)
Relative to Canada balsam mounting medium (n ≈ 1.537).
Relative to Canada balsam mounting medium (n ≈ 1.537).
This shows the grain boundary and Becke line effect under plane-polarised
light, based on the contrast between this mineral's average refractive
index and the mounting medium. It does not take into account mineral
colouration.
In focus
Interference Figure:
This shows the idealized biaxial acute bisectrix (Bxa) interference figure
- the conoscopic view for a grain cut perpendicular to the acute bisectrix, using
this mineral's 2V. The two small white dots mark the melatopes - the points
where the two optic axes emerge - and are shown only when they fall within the
field of view. The coloured bands are isochromatics, and the dark bands are
isogyres.
Rotate the stage: at 0°/90° the isogyres form a cross through the melatopes; at 45° they pull apart into curved hyperbolas. That splitting on rotation - absent in a uniaxial figure - is the standard diagnostic test for telling biaxial minerals from uniaxial ones. If 2V is large, the melatopes may fall outside the field of view, as they often do at the microscope too.
Rotate the stage: at 0°/90° the isogyres form a cross through the melatopes; at 45° they pull apart into curved hyperbolas. That splitting on rotation - absent in a uniaxial figure - is the standard diagnostic test for telling biaxial minerals from uniaxial ones. If 2V is large, the melatopes may fall outside the field of view, as they often do at the microscope too.
Dispersion:
r < v, medium
Pleochroism:
Non-pleochroic
Chemistry of Magnesiokoritnigite
Mindat Formula:
Mg(AsO3OH) · H2O
Element Weights:
Elements listed:
Crystallography of Magnesiokoritnigite
Crystal System:
Triclinic
Class (H-M):
1 - Pinacoidal
Space Group:
P1
Cell Parameters:
a = 7.8702(7) Å, b = 15.8081(6) Å, c = 6.6389(14) Å
α = 90.814(6)°, β = 96.193(6)°, γ = 90.094(7)°
α = 90.814(6)°, β = 96.193(6)°, γ = 90.094(7)°
Ratio:
a:b:c = 0.498 : 1 : 0.42
Unit Cell V:
821.06 ų
Z:
8
Morphology:
Thin to thick laths up to 2 mm long. Laths are elongated on [001], flattened on {010} and exhibit the forms {010}, {110}, {11İ0}, {101}, {031} and {03İ1}.
X-Ray Powder Diffraction
Powder Diffraction Data:
| d-spacing | Intensity |
|---|---|
| 7.96 Å | (100) |
| 4.80 Å | (54) |
| 3.791 Å | (85) |
| 3.242 Å | (56) |
| 3.157 Å | (92) |
| 3.021 Å | (61) |
| 2.798 Å | (51) |
| 1.908 Å | (43) |
Reference:
Comments:
From Type Description.
Geological Environment
Paragenetic Mode(s):
| Paragenetic Mode | Earliest Age (Ga) |
|---|---|
| Stage 7: Great Oxidation Event | <2.4 |
| 47a : [Near-surface hydration of prior minerals] | |
| 47d : [Arsenates, antimonates, selenates, bismuthinates] |
Type Occurrence of Magnesiokoritnigite
General Appearance of Type Material:
thin to thick laths up to 2 mm long
Place of Conservation of Type Material:
Type material is deposited in the collections of the Natural History Museum of Los Angeles County, Los Angeles, California, USA, catalogue numbers 64057, 64058 and 64059
Geological Setting of Type Material:
Formed from the oxidation of native arsenic and other As-bearing primary phases, followed by later alteration by saline fluids derived from evaporating meteoric water under hyperarid conditions
Associated Minerals at Type Locality:
Synonyms of Magnesiokoritnigite
Other Language Names for Magnesiokoritnigite
Dutch:Magnesiokoritnigiet
German:Magnesiokoritnigit
Relationship of Magnesiokoritnigite to other Species
Member of:
Other Members of Koritnigite Group:
| Cobaltkoritnigite | Co(AsO3OH) · H2O | Tric. 1 : P1 |
| Koritnigite | Zn(AsO3OH) · H2O | Tric. 1 : P1 |
Common Associates
Associations Based on Photo Data:
| 18 photos of Magnesiokoritnigite associated with Lavendulan | NaCaCu5(AsO4)4Cl · 5H2O |
| 16 photos of Magnesiokoritnigite associated with Canutite | NaMn3[AsO4][AsO3(OH)]2 |
| 4 photos of Magnesiokoritnigite associated with Gypsum | CaSO4 · 2H2O |
| 3 photos of Magnesiokoritnigite associated with Currierite | Na4Ca3MgAl4(AsO3OH)12 · 9H2O |
| 3 photos of Magnesiokoritnigite associated with Halite | NaCl |
| 3 photos of Magnesiokoritnigite associated with Torrecillasite | Na(As,Sb)3+4O6Cl |
| 2 photos of Magnesiokoritnigite associated with Tamarugite | NaAl(SO4)2 · 6H2O |
| 1 photo of Magnesiokoritnigite associated with Magnesiocanutite | NaMnMg2[AsO4]2[AsO2(OH)2] |
Related Minerals - Strunz-mindat Grouping
| 8.CB. | Krupičkaite | Cu6[AsO3(OH)]6 · 8H2O |
| 8.CB.X | Honzaite | Ni2(AsO3OH)2 · 5H2O |
| 8.CB.X | Redondite | AlPO4 · 2H2O |
| 8.CB.05 | Ermeloite | Al(PO4) · H2O |
| 8.CB.05 | Serrabrancaite | MnPO4 · H2O |
| 8.CB.10 | Nyholmite | Cd3Zn2(AsO3OH)2(AsO4)2 · 4H2O |
| 8.CB.10 | Villyaellenite | (Mn,Ca)Mn2Ca2(AsO3OH)2(AsO4)2 · 4H2O |
| 8.CB.10 | Giftgrubeite | CaMn2Ca2(AsO4)2(AsO3OH)2 · 4H2O |
| 8.CB.10 | Hureaulite | Mn2+5(PO3OH)2(PO4)2 · 4H2O |
| 8.CB.10 | Miguelromeroite | Mn2+5(AsO3OH)2(AsO4)2(H2O)4 |
| 8.CB.10 | 'UM1997-09-AsO:CaHMgZn' | (Mg,Ca,Zn)5(AsO4)2(HAsO4)2 · 4H2O |
| 8.CB.15 | Krautite | Mn(HAsO4) · H2O |
| 8.CB.20 | Cobaltkoritnigite | Co(AsO3OH) · H2O |
| 8.CB.20 | Koritnigite | Zn(AsO3OH) · H2O |
| 8.CB.25 | Yvonite | Cu(HAsO4) · 2H2O |
| 8.CB.30 | Geminite | Cu2+(AsO3OH) · H2O |
| 8.CB.35 | Schubnelite | Fe3+VO4 · H2O |
| 8.CB.40 | Radovanite | Cu2Fe3+(AsO4)(HAs3+O3)2 · H2O |
| 8.CB.45 | Kazakhstanite | Fe3+5V4+3V5+12O39(OH)9 · 9H2O |
| 8.CB.50 | Kolovratite | NixZny(VO4)0.67(x+y) · nH2O |
| 8.CB.60 | Burgessite | Co2(H2O)4[AsO3(OH)]2(H2O) |
| 8.CB.65 | Cardite | Zn5.5(AsO4)2(AsO3OH)(OH)3 · 3H2O |
Other Information
Notes:
The mineral is slowly soluble in concentrated HCl or HNO3 and very slowly soluble in concentrated H2SO4.
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 Magnesiokoritnigite
mindat.org URL:
https://www.mindat.org/min-43924.html
Please feel free to link to this page.
Please feel free to link to this page.
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References for Magnesiokoritnigite
Reference List:
Williams, P. A., Hatert, F., Pasero, M., Mills, S. J. (2013) New minerals and nomenclature modifications approved in 2013. CNMNC Newsletter No.17. Mineralogical Magazine, 77 (7) 2997-3005 doi:10.1180/minmag.2013.077.7.09
Localities for Magnesiokoritnigite
Showing 2 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.
Chile (TL) | |
| Williams et al. (2013) +2 other references |
Greece | |
| Rieck et al. (2018) |
Quick NavTopAbout MagnesiokoritnigiteUnique IdentifiersIMA Classification Classification Mineral SymbolsPhysical Properties Optical Data Chemistry Crystallography X-Ray Powder DiffractionGeological EnvironmentType Occurrence SynonymsOther LanguagesRelationshipsCommon AssociatesStrunz-MindatOther InformationInternet Links References Localities Locality List
Torrecillas mine, Iquique, Iquique Province, Tarapacá, Chile