Krasnovite
A valid IMA mineral species
This page is currently not sponsored. Click here to sponsor this page.
About Krasnovite
Formula:
Ba(Al,Mg)(PO4,CO3)(OH)2 · H2O
Colour:
Pale blue
Lustre:
Silky
Hardness:
2
Specific Gravity:
3.70
Crystal System:
Orthorhombic
Name:
Named in honor of Natalia Ivanovna Krasnova (Наталия Ивановна Краснова) (1941-), mineralogist at St. Petersburg University.
This page provides mineralogical data about Krasnovite.
Unique Identifiers
Mindat ID:
7145
Long-form identifier:
mindat:1:1:7145:7
Similar Names
| Kravtsovite | A valid IMA mineral species | PdAg2S |
| Krásnoite | A valid IMA mineral species | Ca3Al7.7Si3P4O23.5(OH)12.1F2 · 8H2O |
IMA Classification of Krasnovite
Approved
IMA Formula:
Ba(Al,Mg)(PO4,CO3)(OH)2·H2O
Approval year:
1991
First published:
1996
Classification of Krasnovite
8.DK.35
8 : PHOSPHATES, ARSENATES, VANADATES
D : Phosphates, etc. with additional anions, with H2O
K : With large and medium-sized cations, (OH, etc.):RO4 > 1:1 and < 2:1
8 : PHOSPHATES, ARSENATES, VANADATES
D : Phosphates, etc. with additional anions, with H2O
K : With large and medium-sized cations, (OH, etc.):RO4 > 1:1 and < 2:1
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 |
|---|---|---|
| Kv | IMA–CNMNC | Warr, L.N. (2021). IMA–CNMNC approved mineral symbols. Mineralogical Magazine, 85(3), 291-320. doi:10.1180/mgm.2021.43 |
Pronunciation of Krasnovite
Pronunciation:
| Play | Recorded by | Country |
|---|---|---|
| Jolyon Ralph | United Kingdom |
Physical Properties of Krasnovite
Silky
Transparency:
Translucent
Colour:
Pale blue
Streak:
White
Hardness:
2 on Mohs scale
Cleavage:
Perfect
Two parallel to [010]
Two parallel to [010]
Density:
3.70(5) g/cm3 (Measured) 3.691 g/cm3 (Calculated)
Optical Data of Krasnovite
Type:
Biaxial (-)
RI values:
nα = 1.616(2) nβ = 1.629(2) nγ = 1.64(2)
2V:
Measured: 70° to 90°, Calculated: 84°
Max. Birefringence:
δ = 0.024
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:
High (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:
strong
Pleochroism:
Non-pleochroic
Chemistry of Krasnovite
Mindat Formula:
Ba(Al,Mg)(PO4,CO3)(OH)2 · H2O
Element Weights:
Crystallography of Krasnovite
Crystal System:
Orthorhombic
Class (H-M):
mmm(2/m2/m2/m) - Dipyramidal
Cell Parameters:
a = 8.939(2) Å, b = 5.669(3) Å, c = 11.073(3) Å
Ratio:
a:b:c = 1.577 : 1 : 1.953
Unit Cell V:
561.13 ų (Calculated from Unit Cell)
Z:
4
Comment:
space group Pnna or Pnnn
X-Ray Powder Diffraction
Powder Diffraction Data:
| d-spacing | Intensity |
|---|---|
| 2.768 Å | (100) |
| 3.479 Å | (82) |
| 5.54 Å | (79) |
| 2.543 Å | (61) |
| 3.345 Å | (59) |
| 2.072 Å | (41) |
| 2.354 Å | (32) |
Geological Environment
Paragenetic Mode(s):
| Paragenetic Mode | Earliest Age (Ga) |
|---|---|
| Stage 4b: Highly evolved igneous rocks | >3.0 |
| 35 : Ultra-alkali and agpaitic igneous rocks | |
| 36 : Carbonatites, kimberlites, and related igneous rocks | |
| Stage 7: Great Oxidation Event | <2.4 |
| 47a : [Near-surface hydration of prior minerals] | |
| 47c : [Carbonates, phosphates, borates, nitrates] |
Type Occurrence of Krasnovite
General Appearance of Type Material:
Spherulites, up to 3 mm across, consisting of pale blue fibers.
Place of Conservation of Type Material:
Mineralogy Department of Saint Petersburg University and the Saint Petersburg Mining Institute, Russia.
Geological Setting of Type Material:
Dolomite carbonatite.
Associated Minerals at Type Locality:
Synonyms of Krasnovite
Other Language Names for Krasnovite
Common Associates
Associations Based on Photo Data:
Related Minerals - Strunz-mindat Grouping
| 8.DK. | Regerite | KFe6(PO4)4(OH)7(H2O)6 · 4H2O |
| 8.DK. | Richelsdorfite | Ca2Cu5Sb(AsO4)4(OH)6Cl · 6H2O |
| 8.DK. | Bimbowrieite | NaMgFe3+5(PO4)4(OH)6 · 2H2O |
| 8.DK. | Puttapaite | Pb2Mn2+2ZnCr3+4O2(AsO4)4(OH)6 · 12H2O |
| 8.DK.10 | Thalliumpharmacosiderite | TlFe3+4[(AsO4)3(OH)4] · 4H2O |
| 8.DK.10 | Natropharmacosiderite | NaFe3+4(AsO4)3(OH)4 · 4H2O |
| 8.DK.10 | Pharmacosiderite | KFe3+4(AsO4)3(OH)4 · 6-7H2O |
| 8.DK.10 | Plumbopharmacosiderite | Pb0.5Fe3+4(AsO4)3(OH)4 · 5H2O |
| 8.DK.10 | Strontiopharmacosiderite | Sr0.5Fe3+4[(AsO4)3(OH)4] · 4H2O |
| 8.DK.10 | Bariopharmacosiderite | Ba0.5Fe3+4(AsO4)3(OH)4 · 5H2O |
| 8.DK.10 | Hydroniumpharmacosiderite | (H3O)Fe3+4(AsO4)3(OH)4 · 4H2O |
| 8.DK.12 | Hydroniumpharmacoalumite | (H3O)Al4(AsO4)3(OH)4 · 4.5H2O |
| 8.DK.12 | Bariopharmacoalumite | Ba0.5Al4(AsO4)3(OH)4 · 4H2O |
| 8.DK.12 | Pharmacoalumite | KAl4(AsO4)3(OH)4 · 6.5H2O |
| 8.DK.12 | Calciopharmacoalumite | Ca0.5Al4(AsO4)3(OH)4 · 5H2O |
| 8.DK.12 | Natropharmacoalumite | NaAl4(AsO4)3(OH)4 · 4H2O |
| 8.DK.15 | Matioliite | NaMgAl5(PO4)4(OH)6 · 2H2O |
| 8.DK.15 | Burangaite | NaFe2+Al5(PO4)4(OH)6 · 2H2O |
| 8.DK.15 | Natrodufrénite | NaFe3+Fe3+5(PO4)4O(OH)5(H2O)2 |
| 8.DK.15 | Dufrénite | Ca0.5Fe2+Fe3+5(PO4)4(OH)6 · 2H2O |
| 8.DK.15 | Gayite | NaMn2+Fe3+5(PO4)4(OH)6 · 2H2O |
| 8.DK.20 | Kidwellite | NaFe3+9+x(PO4)6(OH)11 · 3H2O, x = 0.33 |
| 8.DK.25 | Bleasdaleite | (Ca,Fe3+)2Cu5(Bi,Cu)(PO4)4(H2O,OH,Cl)13 |
| 8.DK.30 | Matulaite | (Fe3+,Al)Al7(PO4)4(PO3OH)2(OH)8(H2O)8 · 8H2O |
Other Information
Notes:
Decomposes with effervescence in warm 10% HCl.
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 Krasnovite
mindat.org URL:
https://www.mindat.org/min-7145.html
Please feel free to link to this page.
Please feel free to link to this page.
Search Engines:
External Links:
Mineral Dealers:
References for Krasnovite
Localities for Krasnovite
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.
Bolivia | |
| Alfredo Petrov and Matthias Rheinlander ... |
Russia (TL) | |
| Britvin et al. (1996) +2 other references |
Quick NavTopAbout KrasnoviteUnique IdentifiersSimilar NamesIMA Classification Classification Mineral SymbolsPronunciation Physical Properties Optical Data Chemistry Crystallography X-Ray Powder DiffractionGeological EnvironmentType Occurrence SynonymsOther LanguagesCommon AssociatesStrunz-MindatOther InformationInternet Links References Localities Locality List
Cerro Sapo, Ayopaya Province, Cochabamba, Bolivia