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Darapskite

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Iquique, Iquique Province, Tarapacá Region, Chile
© 2007, J. Weissman

Formula:
Na
 
3
NO
 
3
SO
 
4
·H
 
2
O
System:MonoclinicColour:Colourless
Lustre:VitreousHardness:2½
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

IMA status:Valid - first described prior to 1959 (pre-IMA) - "Grandfathered"
Strunz 8th edition ID:6/D.16-10
Nickel-Strunz 10th (pending) edition ID: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 edition ID:20.1.1.1
Dana 8th edition ID:20.1.1.1

20 : COMPOUND NITRATES
1 : Miscellaneous
Hey's CIM Ref.:13.9

13 : Nitrates
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Type Occurrence of Darapskite

Type Locality:Pampa del Toro, Oficina Lautaro, Antofagasta Region, Chile
Year of Discovery:1891

Occurrences of Darapskite

Geological Setting:Nitrate deposits rich in sulfates.

Physical Properties of Darapskite

Lustre:Vitreous
Diaphaneity (Transparency):Transparent
Colour:Colourless
Streak:White
Hardness (Mohs):2½
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°
Maximum Birefringence:δ = 0.098

Chart 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:
Na
 
3
NO
 
3
SO
 
4
·H
 
2
O
Essential elements:H, N, Na, O, S
All elements listed in formula:H, N, Na, O, S

Relationship of Darapskite to other Species

Common Associates:
NitratineHaliteBlöditeAnhydrite
Related Minerals - Nickel-Strunz Grouping):
7.DG.10Clinoungemachite
(Na, K, Fe, SO
 
4
)
7.DG.10Humberstonite
Na
 
7
K
 
3
Mg
 
2
(SO
 
4
)
 
6
(NO
 
3
)
 
2
·6H
 
2
O
7.DG.10Ungemachite
K
 
3
Na
 
8
Fe(SO
 
4
)
 
6
(NO
 
3
)
 
2
·6H
 
2
O
7.DG.15Bentorite
Ca
 
6
(Cr
3+
 
,Al)
 
2
[(OH)
 
4
|SO
 
4
]
 
3
 · 26H
 
2
O
7.DG.15Charlesite
Ca
 
6
(Al,Si)
 
2
[(OH,O)
 
12
|B(OH)
 
4
|(SO
 
4
)
 
2
] · 26H
 
2
O
7.DG.15Ettringite
Ca
 
6
Al
 
2
[(OH)
 
4
|SO
 
4
]
 
3
 · 26H
 
2
O
7.DG.15Jouravskite
Ca
 
6
Mn
3+
2
[(OH)
 
4
|(SO
 
4
,CO
 
3
)]
 
3
 · 26H
 
2
O
7.DG.15Sturmanite
Ca
 
6
(Fe
3+
 
,Al,Mn
3+
 
)
 
2
[(OH)
 
12
|B(OH)
 
4
|(SO
 
4
)
 
2
] · 25H
 
2
O
7.DG.15Thaumasite
Ca
 
3
[CO
 
3
|SO
 
4
|Si(OH)
 
6
] · 12H
 
2
O
7.DG.15Carraraite
Ca
 
3
Ge(OH)
 
6
(SO
 
4
)(CO
 
3
)·12H
 
2
O
7.DG.15Buryatite
Ca
 
3
(Si,Fe,Al)[SO
 
4
][B(OH)
 
4
](OH)
 
5
O•
 
12
H
 
2
O
7.DG.15Korkinoite
7.DG.20Rapidcreekite
Ca
 
2
[CO
 
3
|SO
 
4
] · 4H
 
2
O
7.DG.25Tatarskite
Ca
 
6
Mg
 
2
(SO
 
4
)
 
2
(CO
 
3
)
 
2
Cl
 
4
(OH)
 
4
·7H
 
2
O
7.DG.25Chelyabinskite
(Ca,Mg)
 
3
[(SO
 
4
,CO
 
3
)
 
2
|Si(OH)
 
6
] · 9H
 
2
O (?)
7.DG.30Nakauriite
Cu
 
8
[(OH)
 
6
|CO
 
3
|(SO
 
4
)
 
4
] · 48H
 
2
O
7.DG.35Chessexite
(Na,K)
 
4
Ca
 
2
(Mg,Zn)
 
3
Al
 
8
[(SO
 
4
)
 
10
|(SiO
 
4
)
 
2
] · 40H
 
2
O
7.DG.40Carlosruizite
K
 
6
(Na,K)
 
4
Na
 
6
Mg
 
10
(SeO
 
4
)
 
12
(IO
 
3
)
 
12
·12H
 
2
O
7.DG.40Fuenzalidaite
K
 
6
(Na,K)
 
4
Na
 
6
Mg
 
10
(SO
 
4
)
 
12
(IO
 
3
)
 
12
·12H
 
2
O
Related Minerals - Hey's Index Grouping:
13.1Nitratine
NaNO
 
3
13.2Niter
KNO
 
3
13.3Gerhardtite
Cu
 
2
[(OH)
 
3
|NO
 
3
]
13.4Nitromagnesite
Mg(NO
 
3
)
 
2
·6H
 
2
O
13.5Nitrocalcite
Ca(NO
 
3
)
 
2
·4H
 
2
O
13.6Nitrobarite
Ba(NO
 
3
)
 
2
13.7Buttgenbachite
Cu
 
19
[(OH)
 
32
|(NO
 
3
)
 
2
|Cl
 
4
] · 2H
 
2
O
13.8Sveite
KAl
 
7
[Cl|(OH)
 
8
|(NO
 
3
)
 
2
]
 
2
 · 8H
 
2
O
13.10Humberstonite
Na
 
7
K
 
3
Mg
 
2
(SO
 
4
)
 
6
(NO
 
3
)
 
2
·6H
 
2
O
13.11Mbobomkulite
(Ni,Cu)Al
 
4
[(OH)
 
12
|{(NO
 
3
)
 
2
,SO
 
4
}] · 3H
 
2
O
13.12Hydrombobomkulite
(Ni,Cu)Al
 
4
[(OH)
 
12
|{(NO
 
3
)
 
2
,SO
 
4
}] · 13-14H
 
2
O
13.13Nickelalumite
(Ni,Cu)Al
 
4
[(OH)
 
12
|{SO
 
4
,(NO
 
3
)
 
2
}] · 3H
 
2
O

Other Names for Darapskite

German names:
Darapskit
Russian names:
Дарапскит
Spanish names:
Darapskita

Other Information

Other Information:Readily soluble in water.
Health Warning: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

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    Localities for Darapskite

    Hide Locality List
    The 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.
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    (TL) indicates type locality. ? 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
      • El Loa Province
        • Calama
    		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 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.
      • 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
      • Iquique 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.
    USA
     
    • Arizona
      • Greenlee Co.
        • Peloncillo Mts
    		Anthony, J.W., et al (1995), Mineralogy of Arizona, 3rd.ed.: 199.
    • California
      • 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.
    Mineral and/or Locality
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