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 - Prismatic H-M Symbol (2/m) Space Group: P 2₁/a

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

By Intensity(I/I_o): 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:

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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Leucophoenicite

Mn7(SiO4)3(OH)2
Dana No: 52.03.02c.02 Strunz No: 09.AF.60
Locality:

Notes:

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