Franklinite | Franklin, NJ Large These are a variety of

These are a variety of hydrated silica often found in volcanic regions where silica-rich water filled cavities and slowly formed these luminous stones

This item is 3" x 3" and weighs 3

showcasing the classic dark carbon impressions against the natural grey shale

They are made of red mudstone and siltstone and can contain minerals like quartz

are fused silica (quartz) with a rough

Franklinite | Franklin, NJ Large These are a variety ofFranklinite is a dense, black, metallic zinc iron manganese oxide mineral belonging to the spinel group. Found in Franklin and Sterling Hill, New Jersey, it is now the official state mineral of New Jersey. It typically forms octahedral crystals, is weakly to moderately magnetic and has a Mohs hardness of 5. 56. 5. These specimen fluoresce beautifully under blacklight, making them incredibly unique! This item is 2. 5 x 2 x 2 and weighs 9. 05 oz