Ungemachite Mineral Data

General Ungemachite Information

Chemical Formula:

K3Na8Fe+++(SO4)6(NO3)2•6(H2O)

Composition:

Molecular Weight = 1,165.54 gm

Potassium 10.06 % K 12.12 % K₂O

Sodium 15.78 % Na 21.27 % Na₂O

Iron 4.79 % Fe 6.85 % Fe₂O₃

Hydrogen 1.04 % H 9.27 % H₂O

Sulfur 16.51 % S 41.22 % SO₃

Nitrogen 2.40 % N 9.27 % N₂O₅

Oxygen 49.42 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

K₃Na₈Fe³⁺(SO₄)₆(NO₃)₂•6(H₂O)

IMA Status:

Valid Species (Pre-IMA) 1936

Locality:

Chuquicamata, Antofagasta, Chile. Link to MinDat.org Location Data.

Name Origin:

Named for Henri-Leon Ungemach (1879-1936), French mineralogist and crystallographer. Secretary of the French Society of Mineralogy from 1919 to 1934.

Name Pronunciation:

Ungemachite + Pronunciation

Synonym:

ICSD 201917

PDF 20-1326

Ungemachite Image

Images:

Ungemachite Metasideronatrite

Comments: Translucent rounded ungemachite microcrystal on yellow metasideronatrite.
Location: Chuquicamata, Antofagasta, Chile. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Ungemachite Crystallography

Axial Ratios:

a:c = 1:2.29298

Cell Dimensions:

a = 10.898, c = 24.989, Z = 3; V = 2,570.24 Den(Calc)= 2.26

Crystal System:

Trigonal - RhombohedralH-M Symbol ( 3) Space Group: R 3

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

By Intensity(I/I_o): 3.43(1), 8.33(0.6), 2.72(0.5),

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Forms: ( 1 1 5) ( 0 1 4) ( 0 1 7) ( 1 1 2) ( 0 2 5) ( 0 1 1) ( 2 2 7) ( 0 0 1)

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Groat L A , Hawthorne F C , American Mineralogist , 71 (1986) p.826-829, Structure of ungemachite, K3Na8Fe(SO4)6(NO3)2.6H2O, a mixed, sulfate-nitrate mineral, Note U(1,2) for N and Na1 have been altered to match symmetry constraints.

Physical Properties of Ungemachite

Cleavage:

{0001} Perfect

Color:

Colorless, Light yellow.

Density:

2.287

Diaphaneity:

Transparent

Fracture:

Brittle - Irregular - Very brittle fracture producing irregular fragments

Habit:

Rhombohedral Crystals - Occurs as well-formed crystals showing rhobohedral crystals.

Hardness:

2.5 - Finger Nail

Luster:

Vitreous (Glassy)

Streak:

white

Optical Properties of Ungemachite

Gladstone-Dale:

CI meas= 0.022 (Excellent) - where the CI = (1-KPDmeas/KC)
CI calc= 0.011 (Superior) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2104,KPDmeas= 0.2079,KC= 0.2127
Ncalc = 1.48 - 1.49

Optical Data:

Uniaxial (+), w=1.449, e=1.502, bire=0.0530.

Calculated Properties of Ungemachite

Electron Density:

Bulk Density (Electron Density)=2.25 gm/cc
note: Specific Gravity of Ungemachite =2.26 gm/cc.

Fermion Index:

Fermion Index = 0.02
Boson Index = 0.98

Photoelectric:

PE_Ungemachite= 3.71 barns/electron
U=PE_Ungemachite x r_electron= 8.35 barns/cc.

Radioactivity:

GRapi = 144.75 (Gamma Ray American Petroleum Institute Units)
Concentration of Ungemachite per GRapi unit = 0.69 (%)

Estimated Radioactivity from Ungemachite - barely detectable

Ungemachite Classification

Dana Class:

32.02.03.01 (32)Compound Sulfates

(32.02)(hydrous) with simple bi-anionic formula

(32.02.03)Dana Group

32.02.03.01 Ungemachite K3Na8Fe(SO4)6(NO3)2•6(H2O) R 3 3

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 Ungemachite Information

References:

NAME( Dana8) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990)

See Also:

Links to other databases for Ungemachite :
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
15 - WWW-MINCRYST

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Ask about Ungemachite here :
Ask-A-Mineralogist from the Mineralogical Society of America
Mindat.org's Discussion Groups
Original Rockhounds Discussion Group
Rockhounds Discussion Group on Yahoo Groups
Mineral Discussion Forum from Fabre Minerals - also available in Español

Print or Cut-and-Paste your Ungemachite Specimen Label here :

Ungemachite

K3Na8Fe+++(SO4)6(NO3)2•6(H2O)
Dana No: 32.02.03.01 Strunz No: 07.DG.10
Locality:

Notes: