Leucophoenicite Mineral Data

Leucophoenicite Mineral Data +

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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

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

$Help on X Ray Diffraction:$ 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

Diaphaniety:

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

Optical Data:

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

Calculated Properties of Leucophoenicite

Electron Density:

r_electron=3.62 gm/cc
note: r_{Leucophoenicite}=3.80 gm/cc.

Fermion Index

Fermion Index = 0.00581
Boson Index = 0.99419

Photoelectric:

PE_{Leucophoenicite}= 14.82 barns/electron
U=PE_{Leucophoenicite} x r_electron= 53.66 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Leucophoenicite is Not Radioactive

Leucophoenicite Classification

Dana Class:

52.3.2c.2 (52)Nesosilicate Insular SiO4 Groups and O, OH, F, and H2O

(52.3)with cations in [6] coordination only

(52.3.2c)Humite group (Humite series)

52.3.2c.1 Humite (Mg,Fe)7(SiO4)3(F,OH)2 P nma 2/m 2/m 2/m

52.3.2c.2 Leucophoenicite Mn7(SiO4)3(OH)2 P 2₁/a 2/m

52.3.2c.3 Manganhumite (Mn,Mg)7(SiO4)3(OH)2 Pbnm 2/m 2/m 2/m

Strunz Class:

VIII/B.04-90 VIII - Silicates

VIII/B - Nesosubsilicates, with anions unfamiliar to tetraheders, cations of octahedral and tetrahedral orientation [4/6]

VIII/B.04 - Humite group

VIII/B.04-10 Norbergite Mg3(SiO4)(F,OH)2 P nma 2/m 2/m 2/m

VIII/B.04-20 Chondrodite (Mg,Fe)5(SiO4)2(F,OH)2 P 2₁/c 2/m

VIII/B.04-30 Humite (Mg,Fe)7(SiO4)3(F,OH)2 P nma 2/m 2/m 2/m

VIII/B.04-40 Clinohumite (Mg,Fe)9(SiO4)4(F,OH)2 P 2₁/c 2/m

VIII/B.04-42 Hydroxylclinohumite! Mg9(SiO4)4(OH,F)2 P 2₁/c 2/m

VIII/B.04-50 Ribbeite (Mn,Mg)5(SiO4)2(OH)2 P nma 2/m 2/m 2/m

VIII/B.04-60 Alleghanyite Mn5(SiO4)2(OH)2 P 2₁/a 2/m

VIII/B.04-70 Reinhardbraunsite Ca5(SiO4)2(OH,F)2 P 2₁/a 2/m

VIII/B.04-80 Manganhumite (Mn,Mg)7(SiO4)3(OH)2 Pbnm 2/m 2/m 2/m

VIII/B.04-90 Leucophoenicite Mn7(SiO4)3(OH)2 P 2₁/a 2/m

VIII/B.04-100 Jerrygibbsite (Mn,Zn)9(SiO4)4(OH)2 Pbn21 mm2

VIII/B.04-110 Sonolite Mn9(SiO4)4(OH,F)2 P 2₁/a 2/m

Other Leucophoenicite Information

References:

NAME( Ford32) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Ford32)

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Leucophoenicite

Mn7(SiO4)3(OH)2
Dana No: 52.3.2c.2 Strunz No: VIII/B.04-90
Locality:

Notes: