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Samfowlerite

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Dr. Samuel Fowler
Formula:
Ca28Mn6Zn4(Be,Zn)4Be12[(OH)3|(SiO4)3|(Si2O7)2]4
Colour:
Colourless
Lustre:
Vitreous, Sub-Vitreous, Resinous
Hardness:
2½ - 3
Specific Gravity:
3.28
Crystal System:
Monoclinic
Name:
Named in 1994 by Roland C. Rouse, Donald Ralph Peacor, Pete J. Dunn, Shu-Chun Su, Peter H. Chi, and Herb Yeates in honor of Dr. Samuel Fowler [October 30, 1779 Newburgh, New York, USA - February 20, 1844 Franklin, New Jersey, USA], "the pre-eminent figure in the history of the Franklin mining district. Dr. Fowler, a physician, scientist, industrialist, and entrepreneur, was instrumental in bringing most of the great American naturalists and scientists of his time to Franklin and encouraging mineralogists in Europe and elsewhere to study the zinc deposits at Franklin" and a US Congressman from New Jersey, 1833-1837. He enlisted the aid of all scientists he could interest in the deposits of Franklin and Sterling Hill, NJ. In 1810, he purchased Mine Hill, with a partner, in Franklin, site of the Franklin orebody. In 1818 and 1824, he acquired the Sterling Mine from the Ogden family.
Minute acute wedge-like colorless crystals. Due to the common size range (under 100 microns), the mineral is difficult to find on a specimen that has a valid crystal.


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Classification of SamfowleriteHide

Approved
Approval Year:
1991
9.BF.10

9 : SILICATES (Germanates)
B : Sorosilicates
F : Sorosilicates with mixed SiO4 and Si2O7 groups; cations in tetrahedral [4] and greater coordination
58.2.7.1

58 : SOROSILICATES Insular, Mixed, Single, and Larger Tetrahedral Groups
2 : Insular, Mixed, Single, and Larger Tetrahedral Groups with cations in [6] and higher coordination; single and double groups (n = 1, 2)

Pronounciation of SamfowleriteHide

Pronounciation:
PlayRecorded byCountry
Jolyon & Katya RalphUnited Kingdom

Physical Properties of SamfowleriteHide

Vitreous, Sub-Vitreous, Resinous
Transparency:
Transparent
Colour:
Colourless
Streak:
White
Hardness:
2½ - 3 on Mohs scale
Tenacity:
Brittle
Cleavage:
None Observed
Density:
3.28 g/cm3 (Measured)    3.30 g/cm3 (Calculated)

Optical Data of SamfowleriteHide

Type:
Biaxial (-)
RI values:
nα = 1.674 nβ = 1.680 nγ = 1.681
2V:
Measured: 29° , Calculated: 44°
Birefringence:
0.007
Max Birefringence:
δ = 0.007
Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.
Surface Relief:
High
Dispersion:
relatively strong
Pleochroism:
Non-pleochroic

Chemical Properties of SamfowleriteHide

Formula:
Ca28Mn6Zn4(Be,Zn)4Be12[(OH)3|(SiO4)3|(Si2O7)2]4
IMA Formula:
Ca14Mn2+3Zn2Be2Be6Si14O52(OH)6
Common Impurities:
Mg,H2O

Crystallography of SamfowleriteHide

Crystal System:
Monoclinic
Class (H-M):
2/m - Prismatic
Space Group:
P21/b
Setting:
P21/c
Cell Parameters:
a = 9.068 Å, b = 17.992 Å, c = 14.586 Å
β = 104.86°
Ratio:
a:b:c = 0.504 : 1 : 0.811
Unit Cell V:
2,300.14 ų (Calculated from Unit Cell)
Z:
2

X-Ray Powder DiffractionHide

Powder Diffraction Data:
d-spacingIntensity
7.735 (2)
4.923 (5)
4.515 (2)
4.228 (5)
3.827 (2)
3.570 (10b)
3.336 (2)
3.239 (2)
3.054 (2)
2.863 (100)
2.771 (40)
2.653 (50)
2.582 (10)
2.492 (5)
2.459 (10)
2.388 (50)
2.329 (20)
2.272 (30)
2.184 (2)
2.132 (2)
2.064 (2)
2.036 (2)
1.959 (2)
1.860 (20)
1.832 (30)
1.803 (20)
1.744 (5)
1.721 (5)
1.689 (20)
1.613 (5)
1.526 (10)
1.504 (2)
1.458 (5)
1.432 (5)
1.407 (2)
1.384 (2)
1.303 (5)

Type Occurrence of SamfowleriteHide

General Appearance of Type Material:
Minute asymmetrical appearing colorless crystals (crystal clusters up to 500 microns known with individual crystals about 50 microns); in cavities on or next to colorless cahnite crystals, but only with orange-pink to light green zoned andradite.
Geological Setting of Type Material:
Marble hosted zinc silicate and zinc oxide bearing ore body
Associated Minerals at Type Locality:

Synonyms of SamfowleriteHide

Other Language Names for SamfowleriteHide

Related Minerals - Nickel-Strunz GroupingHide

9.BF.05HarstigiteCa6(Mn,Mg)Be4Si6(O,OH)24Orth.
9.BF.15DavreuxiteMnAl6Si4O17(OH)2Mon.
9.BF.20QueititePb4Zn2(SO4)(SiO4)(Si2O7)Mon. 2 : P21

Fluorescence of SamfowleriteHide

Fluoresceces weakly under both SW and LW ultraviolet, but the minute size of the crystals renders the response almost unobservable, even when viewed with a microscope at 30X.

Other InformationHide

Health Risks:
No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.

References for SamfowleriteHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Rouse, Roland C., Peacor, Donald Ralph, Dunn, Pete J., Su, Shu-Chun, Chi, Peter H., and Yeates, Herb (1994) Samfowlerite, a New Ca Mn Zn beryllosilicate Mineral from Franklin, new Jersey: its Characterization and Crystal Structure, Canadian Mineralogist: 32: 43-53.

Internet Links for SamfowleriteHide

Localities for SamfowleriteHide

This map shows a selection of localities that have latitude and longitude coordinates recorded. Click on the symbol to view information about a locality. The symbol next to localities in the list can be used to jump to that position on the map.

Locality ListHide

- This locality has map coordinates listed. - This locality has estimated coordinates. ⓘ - Click for further information on this occurrence. ? - Indicates mineral may be doubtful at this locality. - Good crystals or important locality for species. - World class for species or very significant. (TL) - Type Locality for a valid mineral species. (FRL) - First Recorded Locality for everything else (eg varieties). Struck out - Mineral was erroneously reported from this locality. Faded * - Never found at this locality but inferred to have existed at some point in the past (eg from pseudomorphs.)

All localities listed without proper references should be considered as questionable.
USA (TL)
 
  • New Jersey
    • Sussex Co.
      • Franklin Mining District
        • Franklin
Rouse, R.C., et al: Canadian Mineralogist:32:43-53 (1994); Dunn(1995):Pt3:419-420.
Mineral and/or Locality  
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