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Walter R. Kellogg


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Mineral Specimen #5162    Hydroxylapatite, Muscovite, Microcline, Quartz

Sapo mine, Ferruginha, Conselheiro Pena, Doce valley, Minas Gerais, Brazil

This specimen consists of numerous crystals of Hydroxylapatite on Microcline. Hydroxylapatite is considerably less common than Fluorapatite. Additionally, the crystal habit exhibited on this specimen is quite unusual for Apatite being flattened, curved, hexagonal bipyramids. The color is a rich sea green with a slight hint of blue. The color varies shading into a lighter, more yellow green color which is found in the middle of the crystals. The color of the Apatite contrasts nicely with the underlying Microcline which is a light peach, orange/pink color. Also present are dark colored Muscovite crystals.

Condition: Good

Flaws: There is some chipping on the edges of some of the crystals. There is the base of a broken Quartz crystal in the middle of the crystal which is not noticeable.

7.4 x 4.4 x 3.5 cm
The largest crystal is 1.4 cm long.


This mineral is also found in the following galleries: Minerals From Brazil | Phosphates | Tectosilicates | Phyllosilicates | Minerals Priced Between 100 and 199 Dollars