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Darapskite

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Formula:
Na3(SO4)(NO3) · H2O
System:
Monoclinic
Colour:
Colourless
Lustre:
Vitreous
Hardness:
Name:
After L. Darapsky of Santiago, Chile.
Often occurs in cavities or crevices in massive nitrate rock or as a surficial concentration (Chile).

Classification of Darapskite

Valid - first described prior to 1959 (pre-IMA) - "Grandfathered"
7.DG.05

7 : SULFATES (selenates, tellurates, chromates, molybdates, wolframates)
D : Sulfates (selenates, etc.) with additional anions, with H2O
G : With large and medium-sized cations; with NO3, CO3, B(OH)4, SiO4 or IO3
Dana 7th ed.:
20.1.1.1
20.1.1.1

20 : COMPOUND NITRATES
1 : Miscellaneous
13.9

13 : Nitrates
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Type Occurrence of Darapskite

Year of Discovery:
1891

Occurrences of Darapskite

Geological Setting:
Nitrate deposits rich in sulfates.

Physical Properties of Darapskite

Vitreous
Diaphaneity (Transparency):
Transparent
Colour:
Colourless
Streak:
White
Hardness (Mohs):
Cleavage:
Perfect
On {010}. Also perfect cleavage on {100} (may be a parting).

Crystallography of Darapskite

Crystal System:
Monoclinic
Class (H-M):
2/m - Prismatic
Cell Parameters:
a = 10.57Å, b = 6.91Å, c = 5.18Å
β = 102.77°
Ratio:
a:b:c = 1.53 : 1 : 0.75
Unit Cell Volume:
V 368.98 ų (Calculated from Unit Cell)
Morphology:
Crystals tabular {100}, and pseudo-tetragonal [100].
Twinning:
Common on {100}. Re-entrant angles on the edges and composition face {100}. Polysynthetic at times.

Optical Data of Darapskite

Type:
Biaxial (-)
RI values:
nα = 1.388 nβ = 1.479 nγ = 1.486
2V:
Measured: 26° to 28°, Calculated: 28°
Max Birefringence:
δ = 0.098
Image shows birefringence interference colour range (at 30µm thickness) and does not take into account mineral colouration.
Surface Relief:
Moderate
Dispersion:
r > v rather strong

Chemical Properties of Darapskite

Formula:
Na3(SO4)(NO3) · H2O
Essential elements:
All elements listed in formula:

Relationship of Darapskite to other Species

7.DG.10Clinoungemachite(Na, K, Fe, SO4)
7.DG.10HumberstoniteNa7K3Mg2(SO4)6(NO3)2 · 6H2O
7.DG.10UngemachiteK3Na8Fe(SO4)6(NO3)2 · 6H2O
7.DG.15BentoriteCa6(Cr3+,Al)2(SO4)3(OH)12 · 26H2O
7.DG.15CharlesiteCa6(Al,Si)2(SO4)2[B(OH)4](OH,O)12 · 26H2O
7.DG.15EttringiteCa6Al2(SO4)3(OH)12 · 26H2O
7.DG.15JouravskiteCa3Mn4+(SO4}(CO3)(OH)6 · 12H2O
7.DG.15SturmaniteCa6(Fe3+,Al,Mn3+)2(SO4)2[B(OH)4](OH)12 · 25H2O
7.DG.15ThaumasiteCa3(SO4)[Si(OH)6](CO3) · 12H2O
7.DG.15CarraraiteCa3(SO4)[Ge(OH)6](CO3) · 12H2O
7.DG.15BuryatiteCa3(Si,Fe,Al)(SO4)[B(OH)4]O(OH)5 · 12H2O
7.DG.20RapidcreekiteCa2(SO4)(CO3) · 4H2O
7.DG.20KorkinoiteCa4(SO4)2(CO3)2 · 9(H2O)
7.DG.25TatarskiteCa6Mg2(SO4)2(CO3)2(OH)4Cl4 · 7H2O
7.DG.30NakauriiteCu8(SO4)4(CO3)(OH)6 · 48H2O
7.DG.35Chessexite(Na,K)4Ca2(Mg,Zn)3Al8(SO4)10(SiO4)2 · 40H2O
7.DG.40CarlosruiziteK6(Na,K)4Na6Mg10(SeO4)12(IO3)12 · 12H2O
7.DG.40FuenzalidaiteK6(Na,K)4Na6Mg10(SO4)12(IO3)12 · 12H2O
7.DG.45Chelyabinskite(Ca,Mg)3(SO4,CO3)2[Si(OH)6] · 9H2O (?)
13.1NitratineNaNO3
13.2NiterKNO3
13.3GerhardtiteCu2(NO3)(OH)3
13.4NitromagnesiteMg(NO3)2 · 6H2O
13.5NitrocalciteCa(NO3)2 · 4H2O
13.6NitrobariteBa(NO3)2
13.7ButtgenbachiteCu19(NO3)2(OH)32Cl4 · 2H2O
13.8SveiteKAl7(NO3)4(OH)16Cl2 · 8H2O
13.10HumberstoniteNa7K3Mg2(SO4)6(NO3)2 · 6H2O
13.11Mbobomkulite(Ni,Cu)Al4((NO3)2,SO4)(OH)12 · 3H2O
13.12Hydrombobomkulite(Ni,Cu)Al4((NO3)2,SO4)(OH)12 · 13-14H2O
13.13Nickelalumite(Ni,Cu)Al4(SO4,(NO3)2)(OH)12 · 3H2O

Other Names for Darapskite

Name in Other Languages:
German:Darapskit
Simplified Chinese:钠硝矾
Spanish:Darapskita

Other Information

Other Information:
Readily soluble in water.
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 Darapskite

Reference List:
Dietze (1891) Zeitschrift für Kristallographie, Mineralogie und Petrographie, Leipzig: 19: 445.

Osann (1894) Zeitschrift für Kristallographie, Mineralogie und Petrographie, Leipzig: 23: 584.

Schulten (1896) Bulletin de la Société française de Minéralogie: 19: 161.

Semper and Michels (1904) Zs. Berg.-Hütt.-und Salinenwesen: 52: 359.

Larsen, E.S. (1921) The Microscopic Determination of the Nonopaque Minerals, First edition, USGS Bulletin 679: 66.

Foote (1925) American Journal of Science: 9: 441 (artif. compound).

Wetzel (1928) Chemie der Erde, Jena: 3: 385, 411.

Hintze, Carl (1930) Handbuch der Mineralogie. Berlin and Leipzig. 6 volumes: 1 [3B]: 4553.

Palache, Charles, Harry Berman & Clifford Frondel (1951), The System of Mineralogy of James Dwight Dana and Edward Salisbury Dana Yale University 1837-1892, Seventh edition, Volume II: 309-311.

American Mineralogist (1970): 55: 1500-1517.

Internet Links for Darapskite

Localities for Darapskite

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.
(TL) indicates type locality for a valid mineral species. (FRL) indicates first recorded locality for everything else. ? indicates mineral may be doubtful at this locality. All other localities listed without reference should be considered as uncertain and unproven until references can be found.
Chile
 
  • Antofagasta Region
    • Antofagasta Province
      • Canchas
American Mineralogist: 79: 1003-1008.
      • Taltal
Natural History Museum Vienna collection
        • Oficina Lautaro
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: 310; American Mineralogist (1970): 55: 1500.
    • 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: 310.
    • Tocopilla Province
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: 310.
      • Pedro de Valdivia
Pueyo, J. J., Chong, G. & Vega, M. (1998): Mineralogy and parental brine evolution in the Pedro de Valdivia nitrate deposit, Antofagasta, Chile. Revista Geologica de Chile 25, 3-15. (in Spanish)
  • Tarapacá Region
    • El Tamarugal Province
      • Huara
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: 310.
      • Oficina Victoria
Am. Min.1989, V74, 1207-1214.
American Mineralogist: 79: 1003-1008.
    • Iquique Province
      • Chanabaya
Gunnar Farber specimens
China
 
  • Xinjiang Autonomous Region
    • Bayin'gholin Autonomous Prefecture (Bayingolin Autonomous Prefecture; Bayinguoleng Autonomous Prefecture)
      • Ruoqiang Co. (Qakilik Co.; Chaqiliq Co.)
Yanling Tang (2005): Non-metallic deposits of Xinjiang, China [Zhongguo Xinjiang Fei Jinshu Kuangchuang]. Geological Publishing House (Beijing), 289 pp.
Bingxiao Li (1992): Journal of Lake Sciences 4(1), 48-55; Keqin Cai, Jianhua Gao, Dejun Zhao, and Youku Yu (1992): Acta Mineralogica Sinica 12(2), 143-151
    • Tulufan Prefecture (Turfan Prefecture; Turpan Prefecture)
      • Shanshan Co. (Piqan Co.; Pichan Co.)
        • Kumtag basin
Wensheng Ge (2008): Presented at the 33rd International Geological Congress, Oslo (Norway), August 6-14, 2008.; Yuezhen Gao (1993): Geology of Chemical Minerals 15(1)
      • Tulufan Co. (Turfan Co.; Turpan Co.)
        • Turfan basin (Turpan basin)
Bingxiao Li (1992): Journal of Lake Sciences 4(1), 48-55
Yanling Tang (2005): Non-metallic deposits of Xinjiang, China [Zhongguo Xinjiang Fei Jinshu Kuangchuang]. Geological Publishing House (Beijing), 289 pp.
Romania
 
  • Hunedoara Co.
    • Cerna valley
Onac, B. P. (2009): ACTA CARSOLOGICA 38/1, 27-39
USA
 
  • Arizona
    • Greenlee Co.
      • Peloncillo Mts
Anthony, J.W., et al (1995), Mineralogy of Arizona, 3rd.ed.: 199.
  • California
    • Inyo Co.
Bailey, Gilbert E. (1902), The saline deposits of California: California Mining Bureau Bulletin 24: 170; Murdoch, Joseph & Robert W. Webb (1966), Minerals of California, Centennial Volume (1866-1966): California Division Mines & Geology Bulletin 189: 166; Pemberton, H. Earl (1983), Minerals of California; Van Nostrand Reinholt Press: 342.
    • San Bernardino Co.
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: 310.
  • New Mexico
NSS Bulletin 43:127-132
  • Texas
    • Brewster Co.
      • Big Bend National Park
Rocks & Minerals: 66(3): 196-224.; Mineralogical Magazine 1977 41 : 548-550.
Mineral and/or Locality  
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