Sofiite
A valid IMA mineral species
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About Sofiite
Formula:
Zn2(SeO3)Cl2
Colour:
Colourless
Lustre:
Vitreous, Greasy, Silky
Hardness:
2 - 2½
Specific Gravity:
3.64 (Calculated)
Crystal System:
Orthorhombic
Name:
Named in honor of Sofia Ivanovna Naboko (Софьа Ивановна Набоко) (13 September 1909, St Petersburg, Russian Empire - 2005), Institute of Volcanology, Petropavlovsk-Kamchatskii, Russia. Naboko was an investigator of postvolcanic processes of Kamchatka. The mineral nabokoite is also named for her.
A synthetic, monoclinic polymorph is known (Johnsson & Törnroos, 2007).
Unique Identifiers
Mindat ID:
3714
Long-form identifier:
mindat:1:1:3714:9
GUID
(UUID V4):
(UUID V4):
b7669376-4957-4865-97fd-78d3ecc44587
IMA Classification of Sofiite
Approved
IMA Formula:
Zn2(Se4+O3)Cl2
First published:
1989
Classification of Sofiite
4.JG.15
4 : OXIDES (Hydroxides, V[5,6] vanadates, arsenites, antimonites, bismuthites, sulfites, selenites, tellurites, iodates)
J : Arsenites, antimonites, bismuthites, sulfites, selenites, tellurites; iodates
G : Selenites with additional anions, without H2O
4 : OXIDES (Hydroxides, V[5,6] vanadates, arsenites, antimonites, bismuthites, sulfites, selenites, tellurites, iodates)
J : Arsenites, antimonites, bismuthites, sulfites, selenites, tellurites; iodates
G : Selenites with additional anions, without H2O
34.6.5.1
34 : SELENITES, TELLURITES AND SULFITES
6 : Anhydrous Selenites, Tellurites and Sulfites containing Hydroxyl or Halogen
34 : SELENITES, TELLURITES AND SULFITES
6 : Anhydrous Selenites, Tellurites and Sulfites containing Hydroxyl or Halogen
28.1.4
28 : Selenites, Selenates, Tellurites, and Tellurates
1 : Selenites
28 : Selenites, Selenates, Tellurites, and Tellurates
1 : Selenites
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 |
---|---|---|
Sof | 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 Sofiite
Vitreous, Greasy, Silky
Transparency:
Transparent
Colour:
Colourless
Comment:
Becoming sky blue on long exposure to air.
Streak:
White
Hardness:
2 - 2½ on Mohs scale
Hardness:
VHN10=38 - 61 kg/mm2 - Vickers
Tenacity:
Brittle
Cleavage:
Perfect
Perfect {010} and less perfect {201}
Perfect {010} and less perfect {201}
Density:
3.64 g/cm3 (Calculated)
Optical Data of Sofiite
Type:
Biaxial (+)
RI values:
nα = 1.709(3) nβ = 1.726(2) nγ = 1.750(2)
2V:
Calculated: 81°
Max Birefringence:
δ = 0.041
Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.
and does not take into account mineral colouration.
Surface Relief:
High
Dispersion:
r > v weak
Chemistry of Sofiite
Mindat Formula:
Zn2(SeO3)Cl2
Elements listed:
Crystallography of Sofiite
Crystal System:
Orthorhombic
Class (H-M):
mmm (2/m 2/m 2/m) - Dipyramidal
Space Group:
Pccn
Setting:
Pccn
Cell Parameters:
a = 10.251(4) Å, b = 15.223(2) Å, c = 7.666(5) Å
Ratio:
a:b:c = 0.673 : 1 : 0.504
Unit Cell V:
1,196.29 ų (Calculated from Unit Cell)
Z:
8
Morphology:
Pseudo-hexagonal thin-platy to mica-like crystals.
Twinning:
Swallowtail twins on {100}.
Crystal Structure
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Data courtesy of the American Mineralogist Crystal Structure Database. Click on an AMCSD ID to view structure
ID | Species | Reference | Link | Year | Locality | Pressure (GPa) | Temp (K) |
---|---|---|---|---|---|---|---|
0014495 | Sofiite | Semenova T F, Rozhdestvenskaya I V, Filatov S K, Vergasova L P (1992) Crystal structure and physical properties of sophiite, Zn2(SeO3)Cl2, a new mineral Mineralogical Magazine 56 241-245 | 1992 | Tolbachik Main Fracture Eruption, Kamchatka, Russia | 0 | 293 |
CIF Raw Data - click here to close
X-Ray Powder Diffraction
Powder Diffraction Data:
d-spacing | Intensity |
---|---|
7.61 Å | (100) |
3.807 Å | (23) |
3.237 Å | (6) |
3.055 Å | (8) |
2.918 Å | (12) |
2.538 Å | (6) |
Comments:
Intensities are affected by preferred orientation owing to the {010} cleavage.
Type Occurrence of Sofiite
General Appearance of Type Material:
Well-formed, pseudo-hexagonal thin-platy to mica-like crystals.
Place of Conservation of Type Material:
Mining Museum, St. Petersburg, Russia, number 1550/1.
Geological Setting of Type Material:
Fumarolic specimens were collected at temperatures 180-230 °C.
Associated Minerals at Type Locality:
Reference:
Vergasova L.P., Filatov S.K., Semenova T.F., Filosofova T.M. (1989) Sofiite Zn2(SeO3)Cl2 - a new mineral from volcanic sublimates. Zapiski Vserossiyskogo Mineralogicheskogo Obshchestva: 118(1): 65-69.
Synonyms of Sofiite
Other Language Names for Sofiite
Related Minerals - Strunz-mindat Grouping
4.JG. | Prewittite | KPb1.5ZnCu6(SeO3)2O2Cl10 |
4.JG. | Guangyuanite | Pb3Cl3(Se4+O3)(OH) |
4.JG. | Masaitisite | KCu5O2(SeO3)2Cl3 |
4.JG. | Wangkuirenite | Pb3Cl2(SeO3)2 |
4.JG.05 | Georgbokiite | Cu5(SeO3)2O2Cl2 |
4.JG.05 | Parageorgbokiite | Cu5(SeO3)2O2Cl2 |
4.JG.10 | Chloromenite | Cu9(SeO3)4O2Cl6 |
4.JG.20 | Ilinskite | (Na,K)Cu5(SeO3)2O2Cl3 |
4.JG.25 | Francisite | Cu3Bi(SeO3)2O2Cl |
4.JG.30 | Derriksite | Cu4(UO2)(SeO3)2(OH)6 |
4.JG.35 | Burnsite | KCdCu2+7(SeO3)2O2Cl9 |
4.JG.40 | Allochalcoselite | Cu+PbCu2+5(SeO3)2Cl5O2 |
4.JG.45 | Nicksobolevite | Cu7(SeO3)2O2Cl6 |
4.JG.50 | Plumboselite | Pb3O2(SeO3) |
4.JG.55 | Sarrabusite | Pb5CuCl4(SeO3)4 |
Other Information
Notes:
Readily soluble in dilute acids, soluble with difficulty in water.
Special Storage/
Display Requirements:
Display Requirements:
Becomes turbid white, and crystals bend and swell, on exposure to air; decomposition products form radial aggregates.
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 Sofiite
mindat.org URL:
https://www.mindat.org/min-3714.html
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References for Sofiite
Reference List:
Localities for Sofiite
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).
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 (e.g. from pseudomorphs).
All localities listed without proper references should be considered as questionable.
All localities listed without proper references should be considered as questionable.
Costa Rica | |
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Greece | |
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Russia (TL) | |
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| Pekov, Igor V., Zubkova, Natalia V., Pautov, Leonid A., Yapaskurt, Vasiliy O., Chukanov, Nikita V., Lykova, Inna S., Britvin, Sergey N., Sidorov, Evgeny G., Pushcharovsky, Dmitry Yu. (2015) Chubarovite, KZn2(BO3)Cl2, a new mineral species from the Tolbachik volcano, Kamchatka, Russia. The Canadian Mineralogist, 53 (2) 273-284 doi:10.3749/canmin.1400080 |
Pekov, Igor V., Zubkova, Natalia V., Britvin, Sergey N., Yapaskurt, Vasiliy O., Chukanov, Nikita V., Lykova, Inna S., Sidorov, Evgeny G., Pushcharovsky, Dmitry Yu. (2015) New zinc and potassium chlorides from fumaroles of the Tolbachik volcano, Kamchatka, Russia: mineral data and crystal chemistry. III. Cryobostryxite, KZnCl3·2H2O. European Journal of Mineralogy, 27 (6) 805-812 doi:10.1127/ejm/2015/0027-2482 | |
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First scoria cone, Northern Breakthrough, Great Fissure eruption, Tolbachik Volcanic field, Milkovsky District, Kamchatka Krai, Russia