Dravertite
A valid IMA mineral species
This page is currently not sponsored. Click here to sponsor this page.
About Dravertite
Petr L. Dravert
Formula:
CuMg(SO4)2
Colour:
Light-blue to colourless; light brown
Lustre:
Vitreous
Hardness:
3½
Specific Gravity:
3.508 (Calculated)
Crystal System:
Monoclinic
Name:
Named in honor of Petr Lyudovikovich Dravert (Пётр Людо́викович Дра́верт) (4 (16) January 1879, Vyatka, Russian Empire – 12 December 1945, Omsk, USSR), mineralogist, geologist, poet, and science fiction writer, for his significant contributions to the mineralogy of Siberia and to studies of Siberian mineral deposits.
Chemically and structurally related to chalcocyanite.
Crystal structure contains chains of alternating edge-sharing octahedra, with centers occupied by Cu or Mg, the second metal forming much more regular ones. The chains are connected via isolated sulfate tetrahedra, thus forming pseudo-framework. The structure is a monoclinically distorted and cation-ordered derivative of that of chalcocyanite.
Minerals associated at the second locality (Yadovitaya fumarole) are: alumoklyuchevskite, chalcocyanite, cryptochalcite, cupromolybdite, dolerophanite, euchlorine, hematite, parawulffite, piypite, steklite, tenorite, vergasovaite, yaroshevskite, and ziesite.
Crystal structure contains chains of alternating edge-sharing octahedra, with centers occupied by Cu or Mg, the second metal forming much more regular ones. The chains are connected via isolated sulfate tetrahedra, thus forming pseudo-framework. The structure is a monoclinically distorted and cation-ordered derivative of that of chalcocyanite.
Minerals associated at the second locality (Yadovitaya fumarole) are: alumoklyuchevskite, chalcocyanite, cryptochalcite, cupromolybdite, dolerophanite, euchlorine, hematite, parawulffite, piypite, steklite, tenorite, vergasovaite, yaroshevskite, and ziesite.
Unique Identifiers
Mindat ID:
46608
Long-form identifier:
mindat:1:1:46608:0
IMA Classification of Dravertite
Approved
IMA Formula:
Cu2+Mg(S6+O4)2
Approval year:
2015
First published:
2017
Type description reference:
Pekov, Igor V., Zubkova, Natalia V., Agakhanov, Atali A., Yapaskurt, Vasiliy O., Chukanov, Nikita V., Belakovskiy, Dmitry I., Sidorov, Evgeny G., Pushcharovsky, Dmitry Y. (2017) Dravertite, CuMg(SO4)2, a new mineral species from the Tolbachik volcano, Kamchatka, Russia. European Journal of Mineralogy, 29 (2) 323-330 doi:10.1127/ejm/2017/0029-2596
Classification of Dravertite
7.AB.
7 : SULFATES (selenates, tellurates, chromates, molybdates, wolframates)
A : Sulfates (selenates, etc.) without additional anions, without H2O
B : With medium-sized cations
7 : SULFATES (selenates, tellurates, chromates, molybdates, wolframates)
A : Sulfates (selenates, etc.) without additional anions, without H2O
B : With medium-sized cations
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 |
|---|---|---|
| Dra | 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 Dravertite
Vitreous
Transparency:
Transparent, Translucent
Colour:
Light-blue to colourless; light brown
Hardness:
3½ on Mohs scale
Tenacity:
Brittle
Cleavage:
Imperfect/Fair
Fracture:
Irregular/Uneven
Density:
3.508 g/cm3 (Calculated)
Comment:
From empirical formula
Optical Data of Dravertite
Type:
Biaxial (-)
RI values:
nα = 1.624(3) nβ = 1.661(3) nγ = 1.663(3)
2V:
Measured: 35° (10)
Max. Birefringence:
δ = 0.039
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.
Chemistry of Dravertite
Mindat Formula:
CuMg(SO4)2
Element Weights:
Elements listed:
Crystallography of Dravertite
Crystal System:
Monoclinic
Class (H-M):
2/m - Prismatic
Space Group:
P21/c
Setting:
P21/n
Cell Parameters:
a = 4.8141(3) Å, b = 8.4443(5) Å, c = 6.7731(4) Å
β = 94.598(5)°
β = 94.598(5)°
Ratio:
a:b:c = 0.57 : 1 : 0.802
Unit Cell V:
274.45 ų
Z:
2
X-Ray Powder Diffraction
Powder Diffraction Data:
| d-spacing | Intensity |
|---|---|
| 4.175 Å | (68) |
| 3.666 Å | (64) |
| 3.579 Å | (63) |
| 3.443 Å | (59) |
| 2.719 Å | (41) |
| 2.637 Å | (100) |
| 2.430 Å | (68) |
| 1.791 Å | (24) |
Reference:
Pekov, Igor V., Zubkova, Natalia V., Agakhanov, Atali A., Yapaskurt, Vasiliy O., Chukanov, Nikita V., Belakovskiy, Dmitry I., Sidorov, Evgeny G., Pushcharovsky, Dmitry Y. (2017) Dravertite, CuMg(SO4)2, a new mineral species from the Tolbachik volcano, Kamchatka, Russia. European Journal of Mineralogy, 29 (2) 323-330 doi:10.1127/ejm/2017/0029-2596
Comments:
From Type Description.
Geological Environment
Paragenetic Mode(s):
| Paragenetic Mode | Earliest Age (Ga) |
|---|---|
| Stage 7: Great Oxidation Event | <2.4 |
| 45a : [Sulfates, arsenates, selenates, antimonates] | |
| 45b : [Other oxidized fumarolic minerals] |
Type Occurrence of Dravertite
General Appearance of Type Material:
Crude equant crystals, up to 0.08 mm, in compact clusters or spherulitic crusts (up to 5 × 5 cm2 in area) and up to 1 cm thick, sitting on basalt matrix
Place of Conservation of Type Material:
Type material is deposited in the collections of the Fersman Mineralogical Museum, Russian Academy of Sciences, Moscow, Russia, registration number 4674/1
Geological Setting of Type Material:
Two active fumaroles (sublimate mineral)
Associated Minerals at Type Locality:
Reference:
Pekov, Igor V., Zubkova, Natalia V., Agakhanov, Atali A., Yapaskurt, Vasiliy O., Chukanov, Nikita V., Belakovskiy, Dmitry I., Sidorov, Evgeny G., Pushcharovsky, Dmitry Y. (2017) Dravertite, CuMg(SO4)2, a new mineral species from the Tolbachik volcano, Kamchatka, Russia. European Journal of Mineralogy, 29 (2) 323-330 doi:10.1127/ejm/2017/0029-2596
Synonyms of Dravertite
Other Language Names for Dravertite
Dutch:Dravertiet
German:Dravertit
Related Minerals - Strunz-mindat Grouping
| 7.AB. | Andymcdonaldite | Fe2TeO6 |
| 7.AB. | Dagenaisite | Zn3Te6+O6 |
| 7.AB.05 | Mikasaite | Fe2(SO4)3 |
| 7.AB.05 | Millosevichite | Al2(SO4)3 |
| 7.AB.05 | Koryakite | NaKMg2Al2(SO4)6 |
| 7.AB.10 | Zinkosite | ZnSO4 |
| 7.AB.10 | Chalcocyanite | CuSO4 |
| 7.AB.15 | Hermannjahnite | CuZn(SO4)2 |
| 7.AB.25 | Ottoite | Pb2TeO5 |
| 7.AB.55 | Mcalpineite | Cu3(Te6+O6) |
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 Dravertite
mindat.org URL:
https://www.mindat.org/min-46608.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 Dravertite
Reference List:
Hålenius, U., Hatert, F., Pasero, M., Mills, S. J. (2015) New minerals and nomenclature modifications approved in 2015, CNMNC Newsletter No 25. Mineralogical Magazine, 79 (3) 529-535 doi:10.1180/minmag.2015.079.3.02
Pekov, Igor V., Zubkova, Natalia V., Agakhanov, Atali A., Yapaskurt, Vasiliy O., Chukanov, Nikita V., Belakovskiy, Dmitry I., Sidorov, Evgeny G., Pushcharovsky, Dmitry Y. (2017) Dravertite, CuMg(SO4)2, a new mineral species from the Tolbachik volcano, Kamchatka, Russia. European Journal of Mineralogy, 29 (2) 323-330 doi:10.1127/ejm/2017/0029-2596
Localities for Dravertite
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.
Italy | |
| Balassone et al. (2019) |
Russia (TL) | |
| Mineralogical Magazine +2 other references |
Quick NavTopAbout DravertiteUnique IdentifiersIMA Classification Classification Mineral SymbolsPhysical Properties Optical Data Chemistry Crystallography X-Ray Powder DiffractionGeological EnvironmentType Occurrence SynonymsOther LanguagesStrunz-MindatOther InformationInternet Links References Localities Locality List
Arsenatnaya fumarole, Second scoria cone, Northern Breakthrough, Great Fissure eruption, Tolbachik Volcanic field, Milkovsky District, Kamchatka Krai, Russia