Darapskite Mineral Data

Darapskite Mineral Data +

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General Darapskite Information

Chemical Formula:

Na3(SO4)(NO3)·(H2O)

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

Empirical Formula:

Na₃(SO₄)(NO₃)·(H₂O)

IMA Status:

Valid Species (Pre-IMA) 1891

Locality:

Link to MinDat.org Location Data.

Synonym:

ICSD 26927

PDF 23-1408

Darapskite Image

Images:

Darapskite

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

Darapskite Crystallography

Axial Ratios:

a:b:c =1.5281:1:0.7506

Cell Dimensions:

a = 10.564, b = 6.913, c = 5.189, Z = 2; beta = 102.77° V = 369.57 Den(Calc)= 2.20

Crystal System:

Monoclinic - PrismaticH-M Symbol (2/m) Space Group: P 2₁/m

$Help on X Ray Diffraction:$ X Ray Diffraction:

By Intensity(I/I_o): 10.29(1), 2.865(0.35), 3.456(0.35),

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Forms: [ 2 0 1] [ 1 0 1] [ 0 1 0] [ 0 0 1] [ 1 1 0] [ 1 0 0]

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Physical Properties of Darapskite

Cleavage:

[100] Perfect, [010] Good

Color:

Colorless.

Density:

2.202

Diaphaniety:

Transparent to Translucent

Fracture:

Brittle - Uneven - Very brittle fracture producing uneven fragments.

Hardness:

2.5 - Finger Nail

Luster:

Vitreous (Glassy)

Streak:

white

Optical Properties of Darapskite

Gladstone-Dale:

CI meas= 0.016 (Superior) - where the CI = (1-KPDmeas/KC)
CI calc= -0.007 (Superior) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2098,KPDmeas= 0.2048,KC= 0.2082

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

Electron Density:

r_electron=2.14 gm/cc
note: r_Darapskite=2.15 gm/cc.

Fermion Index

Fermion Index = 0.05817
Boson Index = 0.94183

Photoelectric:

PE_Darapskite= 1.34 barns/electron
U=PE_Darapskite x r_electron= 2.86 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Darapskite is Not Radioactive

Darapskite Classification

Dana Class:

20.1.1.1 (20)Compound Nitrates

(20.1)with other anions

(20.1.1)Dana Group

20.1.1.1 Darapskite Na3(SO4)(NO3)·(H2O) P 2₁/m 2/m

Strunz Class:

VI/D.16-10 VI - Sulfates,Chromates,Molybdates and Tungstates

VI/D - Water-bearing sulfates with unfamiliar anions. cations of medium and very big size

VI/D.16 - Darapskite - Humberstonite series

VI/D.16-10 Darapskite Na3(SO4)(NO3)·(H2O) P 2₁/m 2/m

VI/D.16-20 Ungemachite K3Na8Fe(SO4)6(NO3)2·6(H2O) R 3 3

VI/D.16-30 Clinoungemachite K3Na9Fe(SO4)6(OH)3·9(H2O)? (pseudo-HEX-R) Mono

VI/D.16-40 Humberstonite K3Na7Mg2(SO4)6(NO3)2·6(H2O) R 3 3

VI/D.16-50 Fuenzalidaite K6(Na,K)4Na6Mg10(SO4)12(IO3)12·12(H2O) P 3c1 3 2/m

VI/D.16-60 Carlosruizite K6(Na,K)4Na6Mg10(SeO4)12(IO3)12·12(H2O) P 3c1 3 2/m

VI/D.16-70 Georgeericksenite! Na6CaMg(IO3)6(CrO4)2·12(H2O) C 2/c 2/m

Other Darapskite Information

References:

PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990)

See Also:

Links to other databases for Darapskite :
1 -Am. Min. Crystal Structure Database 2 -Athena 3 - EUROmin Project 4 -Google Images 5 -Google Scholar 6 -Handbook of Mineralogy (UofA) 7 -MinDAT 8 -MinMax(Deutsch) 9 -MinMax(English) 10 -Mineralienatlas (Deutsch) 11 -QUT Mineral Atlas 12 - WWW-MINCRYST 13 -École des Mines de Paris

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Darapskite

Na3(SO4)(NO3)·(H2O)
Dana No: 20.1.1.1 Strunz No: VI/D.16-10
Locality:

Notes: