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 % H2 O
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 - Prismatic H-M Symbol (2/m) Space Group: P 21 /a
X Ray Diffraction:
By Intensity(I/Io ): 1.806(1), 2.877(0.9), 2.684(0.8),
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:
PELeucophoenicite = 14.82 barns/electronU=PELeucophoenicite x r Electron 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
Search for Leucophoenicite using:
[AOL ]
[Bing ]
[Dog Pile ]
[GeoScienceWorld ]
[HotBot ]
[Ixquick ]
[Lycos ]
[MAMMA ]
[Scirus ]
[Teoma ]
[WebCrawler ]
[Wikipedia ]
[YAHOO ]
Visit our Advertisers for Leucophoenicite :
Ask about Leucophoenicite 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
Espa�ol
Print or Cut-and-Paste your Leucophoenicite Specimen Label here :
Leucophoenicite
Mn7(SiO4)3(OH)2
Dana No: 52.03.02c.02 Strunz No: 09.AF.60
Locality:
Notes:
Dakota Matrix
Excalibur Minerals
Exceptional Minerals
Hudson Insitute
John Betts Fine Minerals
Mc Dougall Minerals
Mineral News
Rock and Mineral Shows
Weinrich Minerals, Inc.