Fluorite Sphalerite from the Upper Silurian age

from the Upper Silurian age

sometimes including growth rings

Each contains at least one (most several) clearly visible insect

in iron smelting and other metallurgy

Each of our fish fossil specimens has been expertly prepared and is 100% authentic and unrestored or repaired

Fluorite Sphalerite from the Upper Silurian ageFluorite is one of the most variable of all crystalline minerals, occurring in shades of blue, green, purple, red and many other colors corresponding to their physical makeup and conditions when the mineral was formed. The name fluorite comes from its use as a flux, or chemical cleaning agent, in iron smelting and other metallurgy. Pure fluorite is clear, but most specimens have vivid color due to various impurities and are often fluorescent. With a