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and not crumbly clay (after Allophane) which means that they are much sturdier and allows the pieces to be displayed with ease
This mine is probably best known for its amazing pink Rhodochrosite and green Fluorite associations
antimony sulfosalt Franckeite consisting of somewhat "sword"-shaped crystals oriented into spherical aggregates
It truly resembles some kind of plant life
hollow cavity on the base of the piece where a good amount of preexisting Anhydrite once grew
Opal Replacing Bivalve Fossil US minerals and not crumbly clay (afterOne of the great classics in terms of Australian Opal. The myriads of Opal found in Australia ranges from the finest Black Opals in the world to many precious multi color Opals including what I believe are the most iconic Opal fossil pseudomorphs extant. This piece was mined in the mid 1960s and features a well preserved bivalve mollusk shell which has been not only fossilized but partially replaced by gemmy multi color Precious Opal. The top portion
