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Dravertite

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About DravertiteHide

Formula:
CuMg(SO4)2
Colour:
Light-blue to colourless; light brown
Lustre:
Vitreous
Hardness:
Specific Gravity:
3.508 (Calculated)
Crystal System:
Monoclinic
Name:
To honor Petr Lyudovikovich Dravert (1879–1945), Russian mineralogist and geologist
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.



Classification of DravertiteHide

Approved
Approval Year:
2015
First Published:
2017
7.AB.

7 : SULFATES (selenates, tellurates, chromates, molybdates, wolframates)
A : Sulfates (selenates, etc.) without additional anions, without H2O
B : With medium-sized cations

Physical Properties of DravertiteHide

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 DravertiteHide

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
Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.
Surface Relief:
Moderate

Chemical Properties of DravertiteHide

Formula:
CuMg(SO4)2

Crystallography of DravertiteHide

Crystal System:
Monoclinic
Class (H-M):
2/m - Prismatic
Cell Parameters:
a = 4.8141(3) Å, b = 8.4443(5) Å, c = 6.7731(4) Å
β = 94.598(5)°
Ratio:
a:b:c = 0.57 : 1 : 0.802
Unit Cell V:
274.45 ų
Z:
2
Comment:
Space group is P21/n

X-Ray Powder DiffractionHide

Powder Diffraction Data:
d-spacingIntensity
4.175(68)
3.666(64)
3.579(63)
3.443(59)
2.719(41)
2.637(100)
2.430(68)
1.791(24)
Comments:
From Type Description.

Occurrences of DravertiteHide

Paragenetic Mode(s):
•  Fumarolic

Type Occurrence of DravertiteHide

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:

Synonyms of DravertiteHide

Related Minerals - Nickel-Strunz GroupingHide

7.AB.05MikasaiteFe2(SO4)3Trig. 3 : R3
7.AB.05Millosevichite(Al,Fe)2(SO4)3Trig. 3 : R3
7.AB.10ChalcocyaniteCuSO4Orth. mmm (2/m 2/m 2/m)
7.AB.10ZinkositeZnSO4Orth.
7.AB.10FerrotelluriteFe(TeO4) (?)

Other InformationHide

Health Risks:
No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.

References for DravertiteHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Pekov, I.V., Zubkova, N.V., Agakhanov, A.A., Yapaskurt, V.O., Chukanov, N.V., Belakovskiy, D.I., Sidorov, E.G. and Pushcharovsky, D.Y. (2015) Dravertite, IMA 2014-104. CNMNC Newsletter No. 25, June 2015, page 530; Mineralogical Magazine, 79: 529-535.
Pekov, I.V., Zubkova, N.V., Agakhanov, A.A., Yapaskurt, V.O., Chukanov, N.V., Belakovskiy, D.I., Sidorov, E.G., Pushcharovsky, D.Y. (2017): Dravertite, CuMg(SO4)2, a new mineral species from the Tolbachik volcano, Kamchatka, Russia. European Journal of Mineralogy, 29: 323-330.

Internet Links for DravertiteHide

Localities for DravertiteHide

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

- This locality has map coordinates listed. - This locality has estimated coordinates. ⓘ - Click for 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 (eg from pseudomorphs.)

All localities listed without proper references should be considered as questionable.
Russia (TL)
 
  • Far-Eastern Region
    • Kamchatka Oblast'
      • Tolbachik volcano
        • Great Fissure eruption (Main Fracture)
          • Northern Breakthrough (North Breach)
            • Second scoria cone
Pekov, I.V., Zubkova, N.V., Agakhanov, A.A., Yapaskurt, V.O., Chukanov, N.V., Belakovskiy, D.I., Sidorov, E.G. and Pushcharovsky, D.Y. (2015) Dravertite, IMA 2014-104. CNMNC Newsletter No. 25, June 2015, page 530; Mineralogical Magazine, 79, 529-535; Pekov, I.V., Zubkova, N.V., Agakhanov, A.A., Yapaskurt, V.O., Chukanov, N.V., Belakovskiy, D.I., Sidorov, E.G., Pushcharovsky, D.Y. (2017): Dravertite, CuMg(SO4)2, a new mineral species from the Tolbachik volcano, Kamchatka, Russia. European Journal of Mineralogy, 29: 323-330.
Mineral and/or Locality  
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