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Tilly Foster Mine Page 1
The Tilly Foster Mine was developed in a magnetite deposit in gneiss located on the northeastern edge of the Hudson Highlands geologic province, an extension of the Reading Prong of New Jersey and Pennsylvania. The province is interpreted as a meta- morphosed sedimentary sequence representing the cores of mountains formed by a continental collision during the Grenville orogeny, some 900 million to one billion years ago. Operated from the 1850's to 1895, the mine produced a low phosphorus iron ore well suited to making Bessemer steel. After an 1895 accident in which 13 miners were killed, the mine was closed. Tilly Foster was noted for chondrodite (some of the world's best), clinochlore, dodecahedral magnetite, and brucite specimens. Serpentine pseudomorphs are classic Tilly specimens and the yellow titanite specimens from Tilly are rare and highly sought after.
M1602 TITANITE Tilly Foster Mine, Brewster, NY, USA Gemmy yellow titanite crystal in calcite cleavage with minor clinochlore.
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Specimen size - approx. 6.5 cm. X 6.2 cm. X 3.0 cm.
M1591 BRUCITE Tilly Foster Mine, Brewster, NY, USA Pale green and white brucite crystals in a seam in lean gneissic magnetite ore. This brucite does not fluoresce.
Specimen size - approx. 12.5 cm. X 9.0 cm. X 7.0 cm.
M0808 MAGNETITE Tilly Foster Mine, Brewster, NY, USA Large dodecahedral magnetite crystal with small clinochlore crystals on lean magnetite, chondrodite ore.
Specimen size - approx. 7.3 cm. X 4.7 cm. X 4.5 cm.
M0743 MAGNETITE, CHONDRODITE Tilly Foster Mine, Brewster, NY, USA Small dodecahedral magnetite cystals, chondrodite crystals on gneissic magnetite, chondrodite ore.
Specimen size - approx. 5.5 cm. X 5.5 cm. X 4.3 cm.
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