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Picromerite

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About PicromeriteHide

Formula:
K2Mg(SO4)2 · 6H2O
Colour:
Colourless, white, reddish, yellowish, grayish; colourless in transmitted light.
Lustre:
Vitreous
Hardness:
Specific Gravity:
2.028
Crystal System:
Monoclinic
Name:
From the Greek for "bitter" and "part" in allusion to the presence of magnesium and was originally applied to material crystallized from an aqueous solution of mixed salts from Vesuvius fumaroles.
Picromerite Group.
Fresh picromerite is colorless. Specimens may dehydrate in collections within days to years (according to the conditions) to white, opaque leonite.

Picromerite-type compounds are labeled Tutton salts in chemistry.


Classification of PicromeriteHide

Approved, 'Grandfathered' (first described prior to 1959)
7.CC.60

7 : SULFATES (selenates, tellurates, chromates, molybdates, wolframates)
C : Sulfates (selenates, etc.) without additional anions, with H2O
C : With medium-sized and large cations
29.3.6.1

29 : HYDRATED ACID AND NORMAL SULFATES
3 : A2B(XO4)2·xH2O
25.3.15

25 : Sulphates
3 : Sulphates of Mg

Physical Properties of PicromeriteHide

Vitreous
Transparency:
Transparent
Colour:
Colourless, white, reddish, yellowish, grayish; colourless in transmitted light.
Comment:
Tints due to admixed materials
Streak:
White
Hardness:
2½ on Mohs scale
Cleavage:
Perfect
On {_201}, perfect.
Density:
2.028 g/cm3 (Measured)    2.039 g/cm3 (Calculated)
Comment:
Measured on artificial material.

Optical Data of PicromeriteHide

Type:
Biaxial (+)
RI values:
nα = 1.461 nβ = 1.463 nγ = 1.476
2V:
Measured: 47° , Calculated: 46°
Max Birefringence:
δ = 0.015
Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.
Surface Relief:
Moderate
Dispersion:
r > v strong

Chemical Properties of PicromeriteHide

Formula:
K2Mg(SO4)2 · 6H2O

Crystallography of PicromeriteHide

Crystal System:
Monoclinic
Class (H-M):
2/m - Prismatic
Cell Parameters:
a = 9.06 Å, b = 12.25 Å, c = 6.12 Å
β = 104.78°
Ratio:
a:b:c = 0.74 : 1 : 0.5
Unit Cell V:
656.75 ų (Calculated from Unit Cell)
Morphology:
Short prismatic [001]. Crusts on other salts; also massive.

X-Ray Powder DiffractionHide

Powder Diffraction Data:
d-spacingIntensity
4.16 (85)
4.06 (95)
3.71 (100)
3.16 (40)
3.06 (70)
2.964 (60)
2.813 (40)
Comments:
Powder data from synthetic material.

Type Occurrence of PicromeriteHide

Geological Setting of Type Material:
Active volcanic fumaroles.

Synonyms of PicromeriteHide

Other Language Names for PicromeriteHide

Italian:Picromeride
Simplified Chinese:软钾镁矾
Spanish:Picromerita
Traditional Chinese:軟鉀鎂礬

Relationship of Picromerite to other SpeciesHide

Other Members of this group:
Boussingaultite(NH4)2Mg(SO4)2 · 6H2OMon. 2/m : P21/b
CyanochroiteK2Cu(SO4)2 · 6H2OMon. 2/m
Mohrite(NH4)2Fe(SO4)2 · 6H2OMon. 2/m : P21/b
Nickelboussingaultite(NH4)2Ni(SO4)2 · 6H2O
NickelpicromeriteK2Ni(SO4)2•6H2OMon. 2/m : P21/b

Common AssociatesHide

Associated Minerals Based on Photo Data:
Halite9 photos of Picromerite associated with Halite on mindat.org.

Related Minerals - Nickel-Strunz GroupingHide

7.CC.CobaltoblöditeNa2Co(SO4)2•4H2OMon. 2/m : P21/b
7.CC.AndychristyitePbCu2+Te6+O5(H2O)Tric. 1 : P1
7.CC.05KrausiteKFe(SO4)2 · H2OMon. 2/m : P21/m
7.CC.10TamarugiteNaAl(SO4)2 · 6H2OMon. 2/m
7.CC.15KaliniteKAl(SO4)2 · 11H2OMon. 2/m : B2/b
7.CC.15MendoziteNaAl(SO4)2 · 11H2OMon. 2/m
7.CC.20Lonecreekite(NH4)Fe3+(SO4)2 · 12H2OIso.
7.CC.20Alum-(K)KAl(SO4)2 · 12H2OIso. m3 (2/m 3) : Pa3
7.CC.20Alum-(Na)NaAl(SO4)2 · 12H2O
7.CC.20Tschermigite(NH4)Al(SO4)2 · 12H2OIso. m3 (2/m 3) : Pa3
7.CC.20LanmuchangiteTl+Al(SO4)2 · 12H2OIso. m3 (2/m 3) : Pa3
7.CC.25VoltaiteK2Fe2+5Fe3+3Al(SO4)12 · 18H2OIso. m3m (4/m 3 2/m) : Fd3c
7.CC.25ZincovoltaiteK2Zn5Fe3+3Al(SO4)12 · 18H2OIso. m3m (4/m 3 2/m) : Fd3c
7.CC.25PertlikiteK2(Fe2+,Mg)2Mg4Fe3+2Al(SO4)12 · 18H2OTet. 4/mmm (4/m 2/m 2/m) : I41/acd
7.CC.25Ammoniomagnesiovoltaite(NH4)2Mg2+5Fe3+3Al(SO4)12 · 18H2OIso. m3m (4/m 3 2/m) : Fd3c
7.CC.30KröhnkiteNa2Cu(SO4)2 · 2H2OMon. 2/m : P21/b
7.CC.35FerrinatriteNa3Fe(SO4)3 · 3H2OTrig. 3 : P3
7.CC.40GoldichiteKFe(SO4)2 · 4H2OMon. 2/m : P21/b
7.CC.45LöweiteNa12Mg7(SO4)13 · 15H2OTrig.
7.CC.50BlöditeNa2Mg(SO4)2 · 4H2OMon. 2/m
7.CC.50NickelblöditeNa2(Ni,Mg)(SO4)2 · 4H2O
7.CC.50ChangoiteNa2Zn(SO4)2 · 4H2OMon. 2/m : P21/b
7.CC.55LeoniteK2Mg(SO4)2 · 4H2OMon. 2/m
7.CC.55MereiteriteK2Fe(SO4)2 · 4H2OMon.
7.CC.60Boussingaultite(NH4)2Mg(SO4)2 · 6H2OMon. 2/m : P21/b
7.CC.60CyanochroiteK2Cu(SO4)2 · 6H2OMon. 2/m
7.CC.60Mohrite(NH4)2Fe(SO4)2 · 6H2OMon. 2/m : P21/b
7.CC.60Nickelboussingaultite(NH4)2Ni(SO4)2 · 6H2O
7.CC.65PolyhaliteK2Ca2Mg(SO4)4 · 2H2OTric. 1
7.CC.70LeightoniteK2Ca2Cu(SO4)4 · 2H2OTric.
7.CC.75AmarilliteNaFe(SO4)2 · 6H2OMon. 2/m : B2/b
7.CC.80KonyaiteNa2Mg(SO4)2 · 5H2OMon. 2/m : P21/b
7.CC.85WattevilleiteNa2Ca(SO4)2 · 4H2O (?)Orth.

Related Minerals - Dana Grouping (8th Ed.)Hide

29.3.6.2CyanochroiteK2Cu(SO4)2 · 6H2OMon. 2/m

Related Minerals - Hey's Chemical Index of Minerals GroupingHide

25.3.1KieseriteMgSO4 · H2OMon. 2/m
25.3.2SanderiteMgSO4 · 2H2OOrth. 2 2 2 : P21 21 21
25.3.3StarkeyiteMgSO4 · 4H2OMon. 2/m : P21/b
25.3.4PentahydriteMgSO4 · 5H2OTric.
25.3.5HexahydriteMgSO4 · 6H2OMon. 2/m : P2/m
25.3.6EpsomiteMgSO4 · 7H2OOrth. 2 2 2 : P21 21 21
25.3.7CaminiteMg7(SO4)5(OH)4 · H2OTet.
25.3.8VanthoffiteNa6Mg(SO4)4Mon. 2/m : P21/b
25.3.9BlöditeNa2Mg(SO4)2 · 4H2OMon. 2/m
25.3.10KonyaiteNa2Mg(SO4)2 · 5H2OMon. 2/m : P21/b
25.3.11LöweiteNa12Mg7(SO4)13 · 15H2OTrig.
25.3.12UklonskoviteNaMg(SO4)F · 2H2OMon.
25.3.13LangbeiniteK2Mg2(SO4)3Iso. 2 3 : P21 3
25.3.14LeoniteK2Mg(SO4)2 · 4H2OMon. 2/m
25.3.16Efremovite(NH4)2Mg2(SO4)3Iso.
25.3.17Boussingaultite(NH4)2Mg(SO4)2 · 6H2OMon. 2/m : P21/b
25.3.18PickeringiteMgAl2(SO4)4 · 22H2OMon. 2/m : P21/b

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 PicromeriteHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Scacchi (1855) Mem. sullo Incendio Vesuvio: 191.
Reichardt (1866) Neues Jahrbuch für Mineralogie, Geologie und Paleontologie, Heidelberg, Stuttgart: 340.
Tutton (1893) Zeitschrift für Kristallographie, Mineralogie und Petrographie, Leipzig: 21: 491.
Tutton (1897) Zeitschrift für Kristallographie, Mineralogie und Petrographie, Leipzig: 27: 113.
Hofmann (1931) Zeitschrift für Kristallographie, Mineralogie und Petrographie, Leipzig: 78: 279
Palache, C., Berman, H., & Frondel, C. (1951), The System of Mineralogy of James Dwight Dana and Edward Salisbury Dana, Yale University 1837-1892, Volume II. John Wiley and Sons, Inc., New York, 7th edition, revised and enlarged, 1124 pp.: 453.
Zeitschrift für Kristallographie (1965): 122: 161-174.

Internet Links for PicromeriteHide

Localities for PicromeriteHide

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.
Austria
 
  • Tyrol
    • North Tyrol
      • Inn valley
        • Innsbruck
          • Hall
            • Hall valley
R. Exel: Die Mineralien und Erzlagerstätten Österreichs (1993)
  • Upper Austria
    • Gmunden
      • Bad Ischl
        • Perneck
R. Exel: Die Mineralien und Erzlagerstätten Österreichs (1993)
      • Hallstatt
R. Exel: Die Mineralien und Erzlagerstätten Österreichs (1993)
Chile
 
  • Antofagasta Region
    • El Loa Province
      • Calama
        • Chuquicamata District
Palache, C., Berman, H., & Frondel, C. (1951), The System of Mineralogy of James Dwight Dana and Edward Salisbury Dana, Yale University 1837-1892, Volume II: 614.
China
 
  • Qinghai Province
    • Hainan Autonomous Prefecture
Sun Da-peng, Li Bing-xiao, Ma Yua-hua, and Lin Qun-zhu (2002): Journal of Salt Lake Research 10(4), 1-12.
    • Haixi Autonomous Prefecture
      • Da Qaidam Co. (Dachaidan Co.)
Shaoxiu Yang (1991): Journal of Lake Sciences 3(1), 1-10
      • Golmud Co. (Ge'ermu Co.)
Dongsheng Hu (1990): Scientia Geologica Sinica 3(7), 259-268; Shaoxiu Yang (1991): Journal of Lake Sciences 3(1), 1-10
      • Lenghu Co.
Xiying Zhang, Haizhou Ma, Donglin Gao, Minggang Zhang, and Tao Wang (2007): Journal of Salt Lake Research 15(2), 12-20.
      • Mangnai Co. (Mangya Co.)
Shaoxiu Yang (1991): Journal of Lake Sciences 3(1), 1-10; Mianping Zheng and Xifang Liu (2010): Acta Geologica Sinica 84(11), 1585-1600
  • Tibet Autonomous Region
    • Ngari Prefecture
      • Gê'gyai Co. (Geji Co.)
Mianping Zheng and Xifang Liu (2010): Acta Geologica Sinica 84(11), 1585-1600
  • Xinjiang Autonomous Region
    • Bayin'gholin Autonomous Prefecture (Bayingolin Autonomous Prefecture; Bayinguoleng Autonomous Prefecture)
      • Ruoqiang Co. (Qakilik Co.; Chaqiliq Co.)
        • Lop Nur (Lop Nuur; Lop lake; Luobu lake; Luobubo)
Lichun Ma, Baoguo Li, Pingan Jiang, Junping Zhong, Jiandong Sheng, Honglie Qiu, and Hongqi Wu (2010): Mineral Deposits 29(4), 616-624
Yanling Tang (2005): Non-metallic deposits of Xinjiang, China [Zhongguo Xinjiang Fei Jinshu Kuangchuang]. Geological Publishing House (Beijing), 289 pp.
    • Tulufan Prefecture (Turfan Prefecture; Turpan Prefecture)
      • Tulufan Co. (Turfan Co.; Turpan Co.)
        • Turfan basin (Turpan basin)
Bingxiao Li (1992): Journal of Lake Sciences 4(1), 48-55
  • Yunnan Province
    • Kunming Prefecture
      • Dongchuan District
        • Dongchuan Cu ore field
Huaning Qiu, Bingquan Zhu, and Dazhong Sun (2000): Geochimica 29(1), 21-27
Czech Republic
 
  • Karlovy Vary Region
    • Krušné Hory Mts (Erzgebirge)
Jan Hloušek
  • South Moravia Region
    • Oslavany
Dokoupilova P., Sulovsky P., Losos Z. 2006: Hematite, hexahydrite and picromerite group from the mine waste of the coal mine Kukla in Oslavany. Mineralogia Polonica - Special Papers, vol. 28, 57-59
Hršelová, P., Cempírek, J., Houzar, S., Sejkora, J. (2013): S,F,Cl-rich mineral assemblages from burned spoil heaps in the Rosice-Oslavany coalfield, Czech Republic. Can. Mineral.: 51(1): 171-188
Germany
 
  • Hesse
    • Fulda
      • Neuhof
A.Dietrich, G.Behnke and T.Thonelt (2004): Kristalle aus der Tiefe - Eine Auswahl von Mineralen aus Kali- und Steinsalzlagerstatten. Kali und Steinsalz:3.p.6-14.
    • Werra valley
      • Heringen
Weiss: "Mineralfundstellen, Deutschland West", Weise (Munich), 1990
      • Phillippsthal
Weiss: "Mineralfundstellen, Deutschland West", Weise (Munich), 1990
  • Lower Saxony
    • Celle
      • Hänigsen
Bode "Mineralien und Fundstellen BRD" from 1989 ISBN 3-925094-24-5 Pg.9
      • Wathlingen
Weiss: "Mineralfundstellen, Deutschland West", Weise (Munich), 1990
    • Hanover
      • Lehrte
Andreas Gerstenberg collection
    • Harz
      • Goslar
        • Astfeld
No reference listed
  • Saxony-Anhalt
    • Börde
      • Morsleben
http://www.mineralienatlas.de/lexikon/index.php/Deutschland/Sachsen-Anhalt/B%C3%B6rde/Morsleben/Schacht%20Bartensleben
http://www.mineralienatlas.de/lexikon/index.php/Deutschland/Sachsen-Anhalt/B%C3%B6rde/Morsleben/Schacht%20Marie
    • Stassfurt Potash deposit
Palache, C., Berman, H., & Frondel, C. (1951), The System of Mineralogy of James Dwight Dana and Edward Salisbury Dana, Yale University 1837-1892, Volume II. John Wiley and Sons, Inc., New York, 7th edition, revised and enlarged, 1124 pp.: 453.
      • Egeln
        • Tarthun
No reference listed
      • Stassfurt
Naumann, Zirkel: "Elemente der Mineralogie", 13th Ed., 1898
  • Thuringia
    • Gera
      • Ronneburg U deposit
T. Witzke & F. Rüger: Lapis 1998(7/8), 26-64
    • Roßleben
http://www.minrec.org/pdfs/MR25-General-P_small.pdf
Iran
 
  • Zanjan Province
    • Dandy to Mahneshan road
Mr. Maziar Nazari
Italy (TL)
 
  • Campania
    • Naples Province
      • Somma-Vesuvius Complex
Russo, M., 2006: I minerali di formazione fumarolica della grande eruzione vesuviana del 1906
  • Piedmont
    • Verbano-Cusio-Ossola Province
      • Ossola Valley
        • Antrona Valley
          • Montescheno
Piccoli, G.C., Maletto, G., Bosio, P., Lombardo, B. (2007). Minerali del Piemonte e della Valle d'Aosta. Associazione Amici del Museo "F. Eusebio" Alba, Ed., Alba (Cuneo) 607 pp.
  • Sicily
    • Catania Province
      • Etna Volcanic Complex
        • Mt Etna
www.cse.speleo.it
Kazakhstan
 
  • Atyrau
    • Atyrau (Gur'yev)
Pekov, I. V. & Abramov, D. V. (1993): Boron deposit of the Inder and its minerals. World of Stones, 1, 23-30.
Peru
 
  • Arequipa Department
    • Caylloma Province
      • Chivay District
Ciesielczuk, J., Żaba, J., Bzowska, G., Gaidzik, K., & Głogowska, M. (2013). Sulphate efflorescences at the geyser near Pinchollo, southern Peru. Journal of South American Earth Sciences, 42, 186-193.
Poland
 
  • Upper Silesia (Śląskie)
    • Rybnik District
      • Czerwionka-Leszczyny Commune
Kruszewski, Ł. (2013): Supergene minerals from the burning coal mining dumps in the Upper Silesian Coal Basin, South Poland. International Journal of Coal Geology: 105: 91-109 (http://www.sciencedirect.com/science/article/pii/S0166516212002881)
    • Upper Silesian Coal Basin
      • Rybnik Coal Area
        • Radlin
Łukasz Kruszewski (2012) Unique chloride assemblage of exhalative origin from burning coal-mining dump in Radlin (Rybnik Coal Area, S Poland). Mineralogical Society of Poland Special Papers 40
  • Wielkopolskie
Wachowiak, J., Pieczka, A. (2016): Motukoreaite from the Kłodawa Salt Dome, Central Poland. Mineralogical Magazine, 80, 277-289
UK
 
  • England
    • North Yorkshire
      • Scarborough
Smith, F.W., Dearlove, J.P.L., Kemp, S.J., Bell, C.P., Milne, C.J. and Pottas, T.L. (2014) Potash – Recent exploration developments in North Yorkshire. Pp. 45-50 in Hunger, E., Brown, T. J. and Lucas, G. (Eds.) Proceedings of the 17th Extractive Industry Geology Conference, EIG Conferences Ltd. 202pp
Ukraine
 
  • Ivano-Frankivs'k Oblast' (Ivanovo-Frankovsk Oblast')
Palache, C., Berman, H., & Frondel, C. (1951), The System of Mineralogy of James Dwight Dana and Edward Salisbury Dana, Yale University 1837-1892, Volume II. John Wiley and Sons, Inc., New York, 7th edition, revised and enlarged, 1124 pp.: 402, 453.
Palache, C., Berman, H., & Frondel, C. (1951), The System of Mineralogy of James Dwight Dana and Edward Salisbury Dana, Yale University 1837-1892, Volume II: 595.
  • L'viv Oblast' (Lviv Oblast'; Lwiw Oblast')
    • Drohobych
rruff.geo.arizona.edu/doclib/hom/picromerite.pdf
USA
 
  • Hawaii
    • Hawaii Co. (Hawaii Island)
Hon, K., Bove, D.J., Lee, L., and Thornber, C., 2009, The origin and zonation of sublimates and precipitates in active Hawaiian lava tubes: Geological Society of America Abstracts with Programs, v. 41, no. 7, p.193.
  • New Mexico
Northrop, Minerals of New Mexico, 3rd. rev. ed. (1996)
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