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Humberstonite Mineral Data

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General Humberstonite Information

Help on Chemical  Formula: Chemical Formula: K3Na7Mg2(SO4)6(NO3)2•6(H2O)
Help on Composition: Composition: Molecular Weight = 1,135.32 gm
   Potassium  10.33 %  K    12.45 % K2O
   Sodium     14.17 %  Na   19.11 % Na2O
   Magnesium   4.28 %  Mg    7.10 % MgO
   Hydrogen    1.07 %  H     9.52 % H2O
   Sulfur     16.95 %  S    42.31 % SO3
   Nitrogen    2.47 %  N     9.51 % N2O5
   Oxygen     50.73 %  O
             ______        ______ 
             100.00 %      100.00 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: K3Na7Mg2(SO4)6(NO3)2•6(H2O)
Help on Environment: Environment: Formed by repeated natural leaching of nitrate ore with reprecipitation in irregular pods above the local regolith.
Help on IMA Status: IMA Status: Approved IMA 1970
Help on Locality: Locality: Oficina Alemania and ten km west of Oficina Mar�ia Elena; an ore in the Taltal nitrate district, Antofagasta; locally abundant in near-surface nitrate layers throughout the Atacama Des Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for James Thomas Humberstone (1850-1939), industrial chemist whose contributions permit economical extraction of nitrate from the Chilean deposits.
Help on Name Pronunciation: Name Pronunciation: Humberstonite + Pronunciation Say HUMBERSTONITE
Help on Synonym: Synonym: ICSD 79142
  PDF 21-682

Humberstonite Image

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Comments: White powdery aggregate of humberstonite.
Location: Oficina Alemanin, Antofagasta, Chile. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Humberstonite Crystallography

Help on Axial Ratios: Axial Ratios: a:c = 1:2.23944
Help on Cell Dimensions: Cell Dimensions: a = 10.9, c = 24.41, Z = 3; V = 2,511.61 Den(Calc)= 2.25
Help on Crystal System: Crystal System: Trigonal - Rhombohedral H-M Symbol ( 3) Space Group: R 3
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 3.393(1), 2.724(0.7), 8.137(0.6),

Physical Properties of Humberstonite

Help on Cleavage: Cleavage: {0001} Perfect
Help on Color: Color: Colorless.
Help on Density: Density: 2.252
Help on Diaphaneity: Diaphaneity: Transparent
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 Humberstonite

Help on Gladstone-Dale: Gladstone-Dale: CI meas= 0.015 (Superior) - where the CI = (1-KPDmeas/KC)
CI calc= 0.014 (Superior) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2022,KPDmeas= 0.202,KC= 0.2052
Ncalc = 1.46
Help on Optical Data: Optical Data: Uniaxial (-), e=1.436, w=1.474, bire=0.0380.

Calculated Properties of Humberstonite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=2.25 gm/cc
note: Specific Gravity of Humberstonite =2.25 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.03
Boson Index = 0.97
Help on Photoelectric: Photoelectric: PEHumberstonite = 2.42 barns/electron
U=PEHumberstonite x relectron= 5.46 barns/cc.
Help on Radioactivity: Radioactivity:

GRapi = 149.14 (Gamma Ray American Petroleum Institute Units)
Concentration of Humberstonite per GRapi unit = 0.67 (%)

Estimated Radioactivity from Humberstonite - barely detectable


Humberstonite Classification

Help on  Dana Class: Dana Class: (32)Compound Sulfates
  (32.02)(hydrous) with simple bi-anionic formula
  (32.02.02)Dana Group Humberstonite K3Na7Mg2(SO4)6(NO3)2•6(H2O) R 3 3
Help on  Strunz Class: Strunz Class: 07.DG.10 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.10 Clinoungemachite K3Na9Fe(SO4)6(OH)3•9(H2O)? (pseudo-HEX-R) Mono
07.DG.10 Humberstonite K3Na7Mg2(SO4)6(NO3)2•6(H2O) R 3 3
07.DG.10 Ungemachite K3Na8Fe(SO4)6(NO3)2•6(H2O) R 3 3

Other Humberstonite Information

Help on References: References: NAME( AntBidBlaNic5) 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 Humberstonite :
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.10





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