Log In
Yaroslavite
A valid IMA mineral species
This page is currently not sponsored. Click here to sponsor this page.
Formula:
Ca3Al2F10(OH)2 · H2O
Colour:
White
Lustre:
Vitreous
Hardness:
4
Specific Gravity:
3.09
Crystal System:
Orthorhombic
Name:
Named after its discovery locality, Yaroslavskoye tin deposit, Primorskii Kray, Russia.
This page provides mineralogical data about Yaroslavite.
Unique Identifiers
Mindat ID:
4353
Long-form identifier:
mindat:1:1:4353:9
IMA Classification of Yaroslavite
Approved
IMA Formula:
Ca3Al2F10(OH)2·H2O
Classification of Yaroslavite
3.CB.50
3 : HALIDES
C : Complex halides
B : Neso-aluminofluorides
3 : HALIDES
C : Complex halides
B : Neso-aluminofluorides
11.6.15.1
11 : HALIDE COMPLEXES
6 : Aluminofluorides - Isolated Octahedra
11 : HALIDE COMPLEXES
6 : Aluminofluorides - Isolated Octahedra
8.6.14
8 : Halides - Fluorides, Chlorides, Bromides and Iodides; also Fluoborates and Fluosilicates
6 : Halides of Al
8 : Halides - Fluorides, Chlorides, Bromides and Iodides; also Fluoborates and Fluosilicates
6 : Halides of Al
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 |
|---|---|---|
| Ysl | 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 Yaroslavite
Pronunciation:
| Play | Recorded by | Country |
|---|---|---|
| Jolyon Ralph | United Kingdom |
Physical Properties of Yaroslavite
Vitreous
Transparency:
Transparent
Colour:
White
Streak:
White
Hardness:
4 on Mohs scale
Hardness:
VHN100=264 - Vickers
Cleavage:
Distinct/Good
One direction, pinacoidal
One direction, pinacoidal
Fracture:
Irregular/Uneven
Density:
3.09 g/cm3 (Measured) 3.15 g/cm3 (Calculated)
Optical Data of Yaroslavite
Type:
Biaxial (+)
RI values:
nα = 1.413 nβ = 1.416 - 1.417 nγ = 1.423
2V:
Measured: 74° , Calculated: 68° to 80°
Max. Birefringence:
δ = 0.010
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 (negative)
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:
relatively strong
Chemistry of Yaroslavite
Mindat Formula:
Ca3Al2F10(OH)2 · H2O
Element Weights:
Crystallography of Yaroslavite
Crystal System:
Orthorhombic
Cell Parameters:
a = 8.74(1) Å, b = 5.53(1) Å, c = 4.51(2) Å
Ratio:
a:b:c = 1.58 : 1 : 0.816
Unit Cell V:
217.98 ų (Calculated from Unit Cell)
Z:
1
Comment:
Point Group: n.d.; Space Group: n.d.
X-Ray Powder Diffraction
Powder Diffraction Data:
| d-spacing | Intensity |
|---|---|
| 4.50 Å | (6) |
| 3.653 Å | (7) |
| 3.445 Å | (10) |
| 2.827 Å | (5) |
| 2.222 Å | (8) |
| 1.835 Å | (6) |
| 1.454 Å | (6) |
Geological Environment
Paragenetic Mode(s):
| Paragenetic Mode | Earliest Age (Ga) |
|---|---|
| Stage 7: Great Oxidation Event | <2.4 |
| 47a : [Near-surface hydration of prior minerals] | |
| 47g : [Halogen-bearing surface weathering minerals] |
Type Occurrence of Yaroslavite
General Appearance of Type Material:
compact oval to spherical growths with radiating fibrous structure, to 3 mm
Place of Conservation of Type Material:
Vernadsky Geological Museum, Moscow, Russia.
Associated Minerals at Type Locality:
Other Language Names for Yaroslavite
Common Associates
Associations Based on Photo Data:
Related Minerals - Strunz-mindat Grouping
| 3.CB.05 | Cryolithionite | Na3Al2(LiF4)3 |
| 3.CB.15 | Elpasolite | K2NaAlF6 |
| 3.CB.15 | Simmonsite | Na2LiAlF6 |
| 3.CB.15 | Cryolite | Na2NaAlF6 |
| 3.CB.20 | Colquiriite | CaLi[AlF6] |
| 3.CB.25 | Leonardsenite | MgAlF5 · 2H2O |
| 3.CB.25 | Weberite | Na2Mg[AlF6]F |
| 3.CB.30 | Karasugite | SrCa[Al(F,OH)7] |
| 3.CB.35 | Usovite | Ba2CaMgAl2F14 |
| 3.CB.40 | Thomsenolite | NaCa[AlF6] · H2O |
| 3.CB.40 | Pachnolite | NaCa[AlF6] · H2O |
| 3.CB.45 | Carlhintzeite | Ca2[AlF6]F · H2O |
| 3.CB.55 | Sbacchiite | Ca2AlF7 |
| 3.CB.60 | Verneite | Na2Ca3Al2F14 |
Fluorescence of Yaroslavite
Pale violet
Other Information
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 Yaroslavite
mindat.org URL:
https://www.mindat.org/min-4353.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 Yaroslavite
Reference List:
Localities for Yaroslavite
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.
Greece | |
| Rieck et al. (2018) |
Russia (TL) | |
| Pekov (1998) |
Quick NavTopUnique IdentifiersIMA Classification Classification Mineral SymbolsPronunciation Physical Properties Optical Data Chemistry Crystallography X-Ray Powder DiffractionGeological EnvironmentType Occurrence Other LanguagesCommon AssociatesStrunz-MindatFluorescence Other InformationInternet Links References Localities Locality List
