This specimen is a solid mass of lavender

but aragonite which forms within caves

This specimen of Mexican Magnetite is heavily decorated with superbly formed octahedral magnetite crystals

It is a beautiful crystal with well defined metallic tetrahedrite crystals and calcite on one side and less defined tetrahedrite with pyrite cubes on the other

It forms prismatic crystals with a variety of colors including white

Pseudomorph Turquoise After Apatite | Perky Box Thumbnail Specimen | Sonora, Mexico Sillimanite This specimen is a solidA pseudomorph occurs when one mineral replaces another but retains the original mineral's crystal structure. In the case of turquoise after apatite pseudomorph, turquoise replaces apatite, but it still retains apatite's crystal shape. This process leads to a visually fascinating specimen where the exterior shape looks like apatite crystals, but the composition and color are distinctly turquoise, often with the bright blue or green shades typical of