Colorless calcite with large crystals Hedenbergite a layer of hematite-included calcite

a layer of hematite-included calcite is deposited on the surface during a later phase of growth

'Agate' refers to chalcedony with banded color

one is shaped like two points of a star with symmetry that doesn't seem accidental (second to last image)

Point length: 4

Colorless calcite with large crystals Hedenbergite a layer of hematite-included calciteLocale: Santa Eulalia, Chihuahua, Mexico Approx dimensions: 3. 5 x 2. 5 x 1" Approx weight: 89g This calcite specimen from Santa Eulalia has large colorless calcite crystals and druzy on a dark iron oxide matrix. The calcite formed a chunky druzy of icy colorless intersecting rhombohedral crystals that almost appear cubic in areas. There are three larger modified rhombohedral crystals perched atop. This is a beautiful example of growth forms typical