Mineralogy Database

Leucophoenicite Mineral Data

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General Leucophoenicite Information

Help on Chemical  Formula: Chemical Formula: Mn7(SiO4)3(OH)2
Help on Composition: Composition: Molecular Weight = 694.83 gm
   Manganese  55.35 %  Mn   71.47 % MnO
   Silicon    12.13 %  Si   25.94 % SiO2
   Hydrogen    0.29 %  H     2.59 % H2O
   Oxygen     32.24 %  O
             ______        ______ 
             100.00 %      100.00 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: Mn2+7(SiO4)3(OH)2
Help on IMA Status: IMA Status: Valid Species (Pre-IMA) 1899
Help on Locality: Locality: Franklin, Sussex Co., New Jersey. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: From the Greek leukos, "pale" and foinis, "red purple", in allusion to its color
Help on Name Pronunciation: Name Pronunciation: Leucophoenicite Say LEUCOPHOENICITE
Help on Synonym: Synonym: ICSD 15176
  PDF 22-1168

Leucophoenicite Image

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Comments: Cinnamon brown crystals of leucophoenicite over deep reddish pink crystals of rhodochrosite.
Location: N'Chwaning Mine, Kalahari Manganese Field, Northern Cape Province, South Africa. Scale: 8 x 4.2 cm.
© John Veevaert

Leucophoenicite Crystallography

Help on Axial Ratios: Axial Ratios: a:b:c =2.2465:1:2.3464
Help on Cell Dimensions: Cell Dimensions: a = 10.842, b = 4.826, c = 11.324, Z = 2; beta = 103.93° V = 575.09 Den(Calc)= 4.01
Help on Crystal System: Crystal System: Monoclinic - Prismatic H-M Symbol (2/m) Space Group: P 21/a
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 1.806(1), 2.877(0.9), 2.684(0.8),

Physical Properties of Leucophoenicite

Help on Cleavage: Cleavage: {001} Indistinct
Help on Color: Color: Brown, Brown, Violet red, Light red, Dark pink.
Help on Density: Density: 3.8
Help on Diaphaneity: Diaphaneity: Transparent to translucent
Help on Fracture: Fracture: Brittle - Generally displayed by glasses and most non-metallic minerals.
Help on Habit: Habit: Massive - Uniformly indistinguishable crystals forming large masses.
Help on Habit: Habit: Striated - Parallel lines on crystal surface or cleavage face.
Help on Hardness: Hardness: 5.5-6 - Knife Blade-Orthoclase
Help on Luminescence: Luminescence: Non-fluorescent.
Help on Luster: Luster: Vitreous (Glassy)
Help on Magnetism: Magnetism: Nonmagnetic

Optical Properties of Leucophoenicite

Help on Gladstone-Dale: Gladstone-Dale: CI meas= 0.007 (Superior) - where the CI = (1-KPDmeas/KC)
CI calc= 0.059 (Fair) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1915,KPDmeas= 0.2021,KC= 0.2036
Ncalc = 1.77 - 1.82
Help on Optical Data: Optical Data: Biaxial (-), a=1.751, b=1.771, g=1.782, bire=0.0310

Calculated Properties of Leucophoenicite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=3.62 gm/cc
note: Specific Gravity of Leucophoenicite =3.80 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.0058181066
Boson Index = 0.9941818934
Help on Photoelectric: Photoelectric: PELeucophoenicite = 14.82 barns/electron
U=PELeucophoenicite x rElectron Density= 53.66 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Leucophoenicite is Not Radioactive

Leucophoenicite Classification

Help on  Dana Class: Dana Class: 52.03.02c.02 (52)Nesosilicate Insular SiO4 Groups and O, OH, F, and H2O
  (52.03)with cations in [6] coordination only
  (52.03.02c)Humite group (Humite series)
52.03.02c.01 Humite (Mg,Fe)7(SiO4)3(F,OH)2 P nma 2/m 2/m 2/m
52.03.02c.02 Leucophoenicite Mn7(SiO4)3(OH)2 P 21/a 2/m
52.03.02c.03 Manganhumite (Mn,Mg)7(SiO4)3(OH)2 Pbnm 2/m 2/m 2/m
52.03.02c.04 Chegemite! Ca7(SiO4)3(OH)2 Pbnm 2/m 2/m 2/m
Help on  Strunz Class: Strunz Class: 09.AF.60 09 - SILICATES (Germanates)
  09.A - Nesosilicates
  09.AF -Nesosilicates with additional anions;
09.AF.60 Leucophoenicite Mn7(SiO4)3(OH)2 P 21/a 2/m

Other Leucophoenicite Information

Help on References: References: NAME( Ford32) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Ford32)
Help on See Also: See Also: Links to other databases for Leucophoenicite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - EUROmin Project
4 - Ecole des Mines de Paris
5 - Franklin Minerals(Dunn)
6 - Franklin Minerals(Palache)
7 - GeoScienceWorld
8 - Google Images
9 - Google Scholar
10 - Handbook of Mineralogy (MinSocAm)
11 - Handbook of Mineralogy (UofA)
12 - MinDAT
13 - Mineralienatlas (Deutsch)
14 - Online Mineral Museum
15 - QUT Mineral Atlas
16 - Ruff.Info

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Dana No: 52.03.02c.02 Strunz No: 09.AF.60





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