Common
Associations: |
Merwinite,
Spurrite, Gehlenite, Vesuvianite, Grossular, Wollastonite,
Thaumasite, Fluorite, Calcite |
Tilleyite
is a rare calcium silicate carbonate mineral that is
rarely (if ever) transparent but may occassionally be
found as small white translucent crystals that can make
attractive gems for collectors of the unusual. It is
always white by itself but may appear pale bluish-white
when associated with blue Calcite at the type locality
of Crestmore, Riverside County, California. The best
location for gem quality crystals is from Redcap Creek,
Queensland, Australia.
Locations
for Tilleyite include the type locality of Crestmore,
Riverside County, California; North Peak, Iron Mountains,
Sierra County, New Mexico; and near Helena, Lewis and
Clark County, Montana, USA. In Ireland, at Barnavave,
near Carlingford, County Louth. From near Kilchoan,
Ardnamurchan, Argyllshire, and Camas Mòr, Isle of Muck,
also on the Isles of Skye and Rhum, Scotland. From the
Güneyce-Ikizdere area, Trabzon Province, Turkey. In
Russia, from near Anakit Creek, at the mouth of the
Lower Tunguska River, central Siberia, and several other
less-well-defined localities. At Kushiro, Hiroshima
Prefecture, and the Akagané mine, Iwate Prefecture,
Japan; and from Redcap Creek, Queensland, Australia.
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