(Mn2+ ; Fe2+ )16 As3+3 Si12 O36(OH)17Schalleritec 2001 Mineral Data Publishing, ver sion 1.2°

Crystal Data: Hexagonal. Point Group: n.d. As markedly hemimorphic crystals, to 2 mm,having steep pyramids and terminated by dull f0001g and f0001g pedions. As slightly rectangularaggregates resembling augen; also granular to massive.
Physical Properties:D(calc.) = [3.48]

Cleavage: f0001g, perfect. Hardness = »5D(meas.) = 3.339{3.368

Optical Properties: Transparent to translucent. Color: Red-brown. Luster: Waxy; pearly on
the basal cleavage.
Optical Class: Uniaxial ({). ! = 1.681{1.704 ² = 1.643{1.679
Cell Data:

Space Group: n.d.

a = 13.36{13.43

c = 14.24{14.31

Z=2

X-ray Powder Pattern: Franklin, New Jersey, USA.
1.688 (100), 2.673 (60), 1.511 (60), 2.466 (50), 2.022 (50), 3.55 (40), 1.975 (40)
Chemistry:
SiO 2TiO2
Al 2 O3
Fe2 O3As2 O 3FeO

(1)
32.0

2.6
12.81

(2)
31.51
0.03
0.01

(3)
31.27

11.41
0.14

12.87

MnO
ZnO
MgOCaOCl
H2 OTotal(1)42.51.6
2.3(2)
48.90

(3)
49.22

0.0
6.82

0.06
0.02
0.11
[6.73]

6.64

100.6

[98.92]100.00(1) Franklin, New Jersey, USA; by electron microprobe, As2 O3 by wet chemical analysis, H2 O bythe Pen¯eld method. (2) KÄo dnitz Valley, Austria; by electron microprobe, average of 13 analyses;
H2 O calculated from stoichiometry; original total given as 99.83%. (3) Mn 16 As3 Si 12 O 36 (OH) 17 :Polymorphism & Series:

Dimorphous with nelenite.

Occurrence: In banded willemite-franklinite ore or rhodonite, from a metamorphosed
stratiform zinc deposit (Franklin, New Jersey, USA); in manganese-rich lenses in quartzitic
chlorite schists probably of marine origin (KÄo dnitz Valley, Austria).
Association: Willemite, franklinite, calcite, rhodonite (Franklin, New Jersey, USA); tephroite,
pyroxmangite, rhodonite, spessartine, rhodochrosite (KÄo dnitz Valley, Austria).
Distribution:Austria.
Name:

From Franklin, Sussex Co., New Jersey, USA. In the KÄo dnitz Valley, Tirol,

For Dr. Waldemar Theodore Schaller (1882{1967), mineralogist, U.S. Geological Survey.

Type Material: Harvard University, Cambridge, Massachusetts, 87106; National Museum of
Natural History, Washington, D.C., USA, R6610.
References: (1) Gage, R.B., E.S. Larsen, and H.E. Vasser (1925) Schallerite, a newarseno-silicate mineral from Franklin Furnace, New Jersey. Amer. Mineral., 10, 9{11. (2) Bauer,L.H. and H. Berman (1928) Friedelite, schallerite, and related minerals. Amer. Mineral., 13,341{348. (3) McConnell, D. (1954) Crystal chemistry of schallerite. Amer. Mineral., 39, 929{936.
(4) Dunn, P.J., D.R. Peacor, J.A. Nelen, and J.A. Norberg (1981) Crystal-chemical data forschallerite, caryopilite and friedelite from Franklin and Sterling Hill, New Jersey. Amer. Mineral.,66, 1054{1062. (5) Albrecht, J. (1990) An As-rich manganiferous mineral assemblage fromthe KÄo dnitz Valley (Eastern Alps, Austria): geology, mineralogy, genetic considerations, andimplications for metamorphic Mn deposits. Neues Jahrb. Mineral., Monatsh., 363{375.
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