Samfowlerite Mineral Data

Samfowlerite Mineral Data +

General Samfowlerite Information

Chemical Formula:

Ca14Mn++3Zn2(Be,Zn)2Be6(SiO4)6(Si2O7)4(OH,F)6

Composition:

Molecular Weight = 2,271.52 gm

Calcium 24.70 % Ca 34.56 % CaO

Manganese 7.26 % Mn 9.37 % MnO

Beryllium 2.02 % Be 5.62 % BeO

Zinc 7.48 % Zn 9.32 % ZnO

Silicon 17.31 % Si 37.03 % SiO₂

Hydrogen 0.43 % H 3.81 % H₂O

Oxygen 39.80 % O

Fluorine 1.00 % F 1.00 % F

- % F -0.42 % -O=F₂

______ ______

100.00 % 100.28 % = TOTAL OXIDE

Empirical Formula:

Ca₁₄Mn²⁺₃Zn_2.6Be_5.1Si₁₄O_56.5H_9.6F_1.2

Environment:

Metamorphosed stratiform Zn-Mn deposit in vugs in granular willemite-franklinite-andradite ore.

IMA Status:

Approved IMA 1994

Locality:

Franklin, Sussex County, New Jersey, USA. Link to MinDat.org Location Data.

Name Origin:

Named for Samuel Fouler, M.D. (1779-1844), who early encouraged study of the Franklin deposits.

Synonym:

ICSD 100313

IMA1991-045

PDF 26-176

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Samfowlerite Crystallography

Axial Ratios:

a:b:c =0.504:1:0.8106

Cell Dimensions:

a = 9.068, b = 17.992, c = 14.586, Z = 2; beta = 104.86° V = 2,300.14 Den(Calc)= 3.28

Crystal System:

Monoclinic - PrismaticH-M Symbol (2/m) Space Group: P 2₁/c

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

By Intensity(I/I_o): 2.863(1), 2.388(0.5), 2.653(0.5),

Crystal Structure:

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Rouse R C , Peacor D R , Dunn P J , Su S-C , Chi P H , Yeates H , The Canadian Mineralogist , 32 (1994) p.43-53, Samfowlerite, a new Ca Mn Zn beryllosilicate mineral, from Franklin, New Jersey: Its characterization and crystal structure, Locality: Franklin, New Jersey, USA

Physical Properties of Samfowlerite

Cleavage:

None

Color:

Colorless, White.

Density:

3.28

Diaphaniety:

Transparent

Habit:

Crystalline - Fine - Occurs as well-formed fine sized crystals.

Hardness:

2.5-3 - Finger Nail-Calcite

Luminescence:

Fluorescent, Short UV=weak red, Long UV=weak red.

Luster:

Vitreous (Glassy)

Streak:

white

Optical Properties of Samfowlerite

Gladstone-Dale:

CI meas= 0.014 (Superior) - where the CI = (1-KPDmeas/KC)
CI calc= 0.014 (Superior) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2068,KPDmeas= 0.2068,KC= 0.2097

Optical Data:

Biaxial (-), a=1.674, b=1.68, g=1.681, bire=0.0070, 2V(Calc)=44, 2V(Meas)=29.

Calculated Properties of Samfowlerite

Electron Density:

r_electron=3.24 gm/cc
note: r_Samfowlerite=3.28 gm/cc.

Fermion Index

Fermion Index = 0.03191
Boson Index = 0.96809

Photoelectric:

PE_Samfowlerite= 9.20 barns/electron
U=PE_Samfowlerite x r_electron= 29.79 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Samfowlerite is Not Radioactive

Samfowlerite Classification

Dana Class:

58.2.7.1 (58)Sorosilicate Insular, Mixed, Single, and Larger Tetrahedral Groups

(58.2)with cations in [6] and higher coordination; single and double groups (n=1,2)

(58.2.7)Dana Group

58.2.7.1 Samfowlerite Ca14Mn3Zn2(Be,Zn)2Be6(SiO4)6(Si2O7)4(OH,F)6 P 2₁/c 2/m

Strunz Class:

VIII/C.24-90 VIII - Silicates

VIII/C - Sorosilicates, mixed structure with [SiO4]2- "inseln" and [Si2O7]6- groups

VIII/C.24 - Pumpellyite group

VIII/C.24-10 Macfallite Ca2(Mn,Al)3(SiO4)(Si2O7)(OH)3 P 2₁/m 2/m

VIII/C.24-20 Sursassite Mn2Al3(SiO4)(Si2O7)(OH)3 P 2₁/m 2/m

VIII/C.24-30 Pumpellyite-(Mg) Ca2MgAl2(SiO4)(Si2O7)(OH)2·(H2O) A2/m 2/m

VIII/C.24-40 Pumpellyite-(Fe++) Ca2Fe(Al,Fe)2(SiO4)(Si2O7)(OH)2·(H2O) A2/m 2/m

VIII/C.24-42 Pumpellyite-(Fe+++) Ca2FeAl2(SiO4)(Si2O7)(OH,O)2·(H2O) A2/m 2/m

VIII/C.24-50 Pumpellyite-(Mn++) Ca2(Mn,Mg)(Al,Mn,Fe)2(SiO4)(Si2O7(OH)2·(H2O) A2/m 2/m

VIII/C.24-60 Julgoldite-(Fe++) Ca2Fe(Fe,Al)2(SiO4)(Si2O7)(OH)2·(H2O) C 2/m 2/m

VIII/C.24-61 Julgoldite-(Fe+++) Ca2Fe(Fe,Al)2(SiO4)(Si2O7)(O,OH)2·(H2O) A2/m 2/m

VIII/C.24-70 Shuiskite Ca2(Mg,Al)(Cr,Al)2(SiO4)(Si2O7)(OH)2·(H2O) A2/m 2/m

VIII/C.24-80 Okhotskite-(Mg)* Ca3(Mg,Mn)(Mn,Al,Fe)(SiO4)(Si2O7)(OH)2·(H2O) Mono

VIII/C.24-80* Okhotskite-(Mn++) Ca2(Mn,Mg)(Mn,Al,Fe)Si3O10(OH)4 A2/m 2/m

VIII/C.24-90 Samfowlerite Ca14Mn3Zn2(Be,Zn)2Be6(SiO4)6(Si2O7)4(OH,F)6 P 2₁/c 2/m

Other Samfowlerite Information

References:

NAME( AntBidBlaNic2) PHYS. PROP.(Am.Min.,Vol.80,p185,1995) OPTIC PROP.(Am.Min.,Vol.80,p185,1995)

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Samfowlerite

Ca14Mn++3Zn2(Be,Zn)2Be6(SiO4)6(Si2O7)4(OH,F)6
Dana No: 58.2.7.1 Strunz No: VIII/C.24-90
Locality:

Notes: