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Samfowlerite

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Dr. Samuel Fowler
Formula:
Ca28Mn6Zn4(Be,Zn)4Be12[(OH)3|(SiO4)3|(Si2O7)2]4
System:
Monoclinic
Colour:
Colourless
Hardness:
2½ - 3
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.

Classification of Samfowlerite

Approved 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)
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Type Occurrence of Samfowlerite

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.
Year of Discovery:
1991
Geological Setting of Type Material:
Marble hosted zinc silicate and zinc oxide bearing ore body

Physical Properties of Samfowlerite

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

Crystallography of Samfowlerite

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

Optical Data of Samfowlerite

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 Samfowlerite

Formula:
Ca28Mn6Zn4(Be,Zn)4Be12[(OH)3|(SiO4)3|(Si2O7)2]4
All elements listed in formula:
Common Impurities:
Mg,H2O

Relationship of Samfowlerite to other Species

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

Other Names for Samfowlerite

Name in Other Languages:

Other Information

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.
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 Samfowlerite

Reference List:
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 Samfowlerite

Localities for Samfowlerite

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.
(TL) indicates type locality for a valid mineral species. (FRL) indicates first recorded locality for everything else. ? indicates mineral may be doubtful at this locality. All other localities listed without reference should be considered as uncertain and unproven until references can be found.
USA (TL)
 
  • New Jersey
    • Sussex Co.
      • Franklin Mining District
        • Franklin
Rouse, R.C., et al: Can.Min.:32:43-53 (1994); Dunn(1995):Pt3:419-420.
Mineral and/or Locality  
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