Calcite is a calcium carbonate mineral, polymorphous with aragonite. Physical mixtures with dolomite are common, and the analyst must be aware of these before commencing work. Occurrence and paragenesis Figure 23-9. Parallel-growth array of calcite crystals from Franklin. Field of view is 1.2 mm in maximum dimension.
Calcite is the most abundant mineral locally.
It comprises most of the Franklin Marble and is abundant as the dominant gangue mineral in both ore deposits. However, these values are strongly affected by mining practices and should not be given great import in a geological sense. Stout calcite crystals with prismatic gageite crystals hosting tiny franklinite crystals. Field of view is 1.5 mm in maximum dimension. The marble also contains dolomite locally, abundant calcium silicates, and numerous accessory minerals.