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Darapskite Mineral Data

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General Darapskite Information

Help on Chemical  Formula: Chemical Formula: Na3(SO4)(NO3)•(H2O)
Help on Composition: Composition: Molecular Weight = 245.05 gm
   Sodium    28.14 %  Na   37.94 % Na2O
   Hydrogen   0.82 %  H     7.35 % H2O
   Sulfur    13.09 %  S    32.67 % SO3
   Nitrogen   5.72 %  N    22.04 % N2O5
   Oxygen    52.23 %  O
            ______        ______ 
            100.00 %      100.00 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: Na3(SO4)(NO3)•(H2O)
Help on Environment: Environment: Found in nitrate deposits, filling veins and cavities in cemented regolith, in an arid region.
Help on IMA Status: IMA Status: Valid Species (Pre-IMA) 1891
Help on Locality: Locality: Antofagasta, from Oficina Lautaro, Pampa del Toro, Taltal district, Chile. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for Ludwig Darapsky (1857-1916), German-Chilean chemist and mineralogist, Santiago, Chile.
Help on Name Pronunciation: Name Pronunciation: Darapskite + Pronunciation Say DARAPSKITE
Help on Synonym: Synonym: ICSD 26927
  PDF 23-1408

Darapskite Image

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Comments: White crystalline granular darapskite.
Location: Iquique, Tarapaca, Chile. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Darapskite Crystallography

Help on Axial Ratios: Axial Ratios: a:b:c =1.5281:1:0.7506
Help on Cell Dimensions: Cell Dimensions: a = 10.564, b = 6.913, c = 5.189, Z = 2; beta = 102.77° V = 369.57 Den(Calc)= 2.20
Help on Crystal System: Crystal System: Monoclinic - Prismatic H-M Symbol (2/m) Space Group: P 21/m
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 10.29(1), 2.865(0.35), 3.456(0.35),
Help on Forms: Forms:

Dbl Clk - Start-Stop Rotation
RMB - Cycle Display Modes
Drag1 - Manipulate Crystal
Drag2 - Resize

S - Stereo
I - Indicies
<space> - Start-Stop Rotation
F - Fit to Screen
M - Menu

Help on Above

Forms: ( 2 0 1) ( 1 0 1) ( 0 1 0) ( 0 0 1) ( 1 1 0) ( 1 0 0)

Warning: this java applet does not work in some browsers because of security restrictions.


Physical Properties of Darapskite

Help on Cleavage: Cleavage: {100} Perfect, {010} Good
Help on Color: Color: Colorless.
Help on Density: Density: 2.202
Help on Diaphaneity: Diaphaneity: Transparent to Translucent
Help on Fracture: Fracture: Brittle - Uneven - Very brittle fracture producing uneven fragments.
Help on Hardness: Hardness: 2.5 - Finger Nail
Help on Luster: Luster: Vitreous (Glassy)
Help on Streak: Streak: white

Optical Properties of Darapskite

Help on Gladstone-Dale: Gladstone-Dale: CI meas= 0.016 (Superior) - where the CI = (1-KPDmeas/KC)
CI calc= 0.016 (Superior) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.205,KPDmeas= 0.2048,KC= 0.2082
Ncalc = 1.46
Help on Optical Data: Optical Data: Biaxial (-), a=1.388, b=1.479, g=1.486, bire=0.0980, 2V(Calc)=28, 2V(Meas)=27.

Calculated Properties of Darapskite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=2.19 gm/cc
note: Specific Gravity of Darapskite =2.20 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.05
Boson Index = 0.95
Help on Photoelectric: Photoelectric: PEDarapskite = 1.34 barns/electron
U=PEDarapskite x rElectron Density= 2.93 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Darapskite is Not Radioactive

Darapskite Classification

Help on  Dana Class: Dana Class: (20)Compound Nitrates
  (20.01)with other anions
  (20.01.01)Dana Group Darapskite Na3(SO4)(NO3)•(H2O) P 21/m 2/m
Help on  Strunz Class: Strunz Class: 07.DG.05 07 - SULFATES (SELENATES, TELLURATES)
  07.D - Sulfates (selenates, etc.) with additional anions, with H2O
  07.DG -With large and medium sized cations; with NO3, CO3, B(OH)4, SiO4 or IO3
07.DG.05 Darapskite Na3(SO4)(NO3)•(H2O) P 21/m 2/m

Other Darapskite Information

Help on References: References: NAME( AntBidBlaNic3) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990)
Help on See Also: See Also: Links to other databases for Darapskite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - EUROmin Project
4 - Ecole des Mines de Paris
5 - GeoScienceWorld
6 - Google Images
7 - Google Scholar
8 - Handbook of Mineralogy (MinSocAm)
9 - Handbook of Mineralogy (UofA)
10 - MinDAT
11 - Mineralienatlas (Deutsch)
12 - Online Mineral Museum
13 - QUT Mineral Atlas
14 - Ruff.Info

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Dana No: Strunz No: 07.DG.05





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