Leucophoenicite Mineral Data

General Leucophoenicite Information

Chemical Formula: Mn7(SiO4)3(OH)2 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 Empirical Formula: Mn²⁺₇(SiO₄)₃(OH)₂ IMA Status: Valid Species (Pre-IMA) 1899 Locality: Franklin, Sussex Co., New Jersey. Link to MinDat.org Location Data. Name Origin: From the Greek leukos, "pale" and foinis, "red purple", in allusion to its color Name Pronunciation: Leucophoenicite Synonym: ICSD 15176   PDF 22-1168  

Leucophoenicite Image

Images:

Leucophoenicite 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

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

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Moore P B , American Mineralogist , 55 (1970) p.1146-1166, Edge-sharing silicate tetrahedra in the crystal structure of leucophoenicite View Additional jPOWD Structure files for Leucophoenicite [1]

 

Physical Properties of Leucophoenicite

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

Optical Properties of Leucophoenicite

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 Optical Data: Biaxial (-), a=1.751, b=1.771, g=1.782, bire=0.0310  

Calculated Properties of Leucophoenicite

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

Leucophoenicite Classification

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

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

References: NAME( Ford32) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Ford32) 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
17 - WWW-MINCRYST
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