Schallerite Mineral Data

Schallerite Mineral Data +

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General Schallerite Information

Chemical Formula:

Mn++16[As+++O2OH][Si12O30](OH)14

Composition:

Molecular Weight = 2,305.90 gm

Manganese 38.12 % Mn 49.22 % MnO

Silicon 14.62 % Si 31.27 % SiO₂

Arsenic 9.75 % As 12.87 % As₂O₃

Hydrogen 0.74 % H 6.64 % H₂O

Oxygen 36.77 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

Mn²⁺₁₆As₃Si₁₂O₃₆(OH)₁₇

Environment:

Metamorphosed zinc deposit. Dimorphous with nelenite.

IMA Status:

Valid Species (Pre-IMA) 1925

Locality:

700 ft level, Franklin mine, Franklin, Sussex Co., New Jersey, USA. Link to MinDat.org Location Data.

Name Origin:

Named for Wakdemar Theodore Shaller ((1852-1967), mineralogist, U. S. Geological Survey.

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Schallerite Crystallography

Axial Ratios:

a:c = 1:1.06567

Cell Dimensions:

a = 13.4, c = 14.28, Z = 2; V = 2,220.59 Den(Calc)= 3.45

Crystal System:

Trigonal - Ditrigonal PyramidalH-M Symbol (3m) Space Group: P 3m1 ?

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

By Intensity(I/I_o): 1.688(1), 1.511(0.6), 2.673(0.6),

Physical Properties of Schallerite

Cleavage:

[0001] Good

Color:

Light brown, Reddish brown.

Density:

3.37

Diaphaniety:

Translucent

Habit:

Massive - Uniformly indistinguishable crystals forming large masses.

Hardness:

4.5-5 - Near Apatite

Luminescence:

Non-fluorescent.

Luster:

Vitreous - Waxy

Magnetism:

Nonmagnetic

Streak:

light brown

Optical Properties of Schallerite

Gladstone-Dale:

CI meas= 0.045 (Good) - where the CI = (1-KPDmeas/KC)
CI calc= 0.067 (Fair) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2004,KPDmeas= 0.2052,KC= 0.2148

Optical Data:

Uniaxial (-), e=1.679, w=1.704, bire=0.0250.

Calculated Properties of Schallerite

Electron Density:

r_electron=3.24 gm/cc
note: r_Schallerite=3.37 gm/cc.

Fermion Index

Fermion Index = 0.007
Boson Index = 0.993

Photoelectric:

PE_Schallerite= 16.95 barns/electron
U=PE_Schallerite x r_electron= 54.89 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Schallerite is Not Radioactive

Schallerite Classification

Dana Class:

72.4.1a.3 (72)Phyllosilicate Two-Dimensional Infinite Sheets with Other Than Six-Membered Rings

(72.4)with 4-, 6-, and 12-membered rings

(72.4.1a)Pyrosmalite group (Pyrosmalite subgroup)

72.4.1a.1 Ferropyrosmalite (Fe,Mn)8Si6O15(OH,Cl)10 P 3m1 3 2/m

72.4.1a.2 Manganpyrosmalite (Mn,Fe)8Si6O15(OH,Cl)10 P 3m1 3 2/m

72.4.1a.3 Schallerite Mn16[AsO2OH][Si12O30](OH)14 P 3m1 ? 3m

Strunz Class:

VIII/H.28-50 VIII - Silicates

VIII/H - Phyllosilicates (layered) Mica minerals with other simple layers, [Si6O15]6- and others

VIII/H.28 - Pyrosmalite series

VIII/H.28-10 Ferropyrosmalite (Fe,Mn)8Si6O15(OH,Cl)10 P 3m1 3 2/m

VIII/H.28-20 Manganpyrosmalite (Mn,Fe)8Si6O15(OH,Cl)10 P 3m1 3 2/m

VIII/H.28-30 Brokenhillite* (Mn,Fe)32[Si24O60]OH29Cl11 P 6₃mc 6mm

VIII/H.28-40 Nelenite (Mn,Fe)16Si12As3O36(OH)17 R 3m 3 2/m

VIII/H.28-50 Schallerite Mn16[AsO2OH][Si12O30](OH)14 P 3m1 ? 3m

VIII/H.28-70 Friedelite Mn8Si6O15(OH,Cl)10 C 2/m 2/m

VIII/H.28-80 Mcgillite (Mn,Fe)8Si6O15(OH)8Cl2 C 2/m 2/m

VIII/H.28-90 Bementite Mn8Si6O15(OH)10 P 2₁/c 2/m

VIII/H.28-100 Varennesite Na8Mn2Si10O25(OH,Cl)2·12(H2O) C mcm 2/m 2/m 2/m

Other Schallerite Information

References:

NAME( Ford32) PHYS. PROP.(Dana8) OPTIC PROP.(Ford32)

See Also:

Links to other databases for Schallerite :
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 - Google Images
8 - Google Scholar
9 - Handbook of Mineralogy (MinSocAm)
10 - Handbook of Mineralogy (UofA)
11 - MinDAT
12 - MinMax(Deutsch)
13 - MinMax(English)
14 - Mineralienatlas (Deutsch)
15 - QUT Mineral Atlas
16 - Ruff.Info

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Schallerite

Mn++16[As+++O2OH][Si12O30](OH)14
Dana No: 72.4.1a.3 Strunz No: VIII/H.28-50
Locality:

Notes: