Rhodochrosite
from Peru
on view at the Harvard Mineralogical & Geological Museum (MGM), Cambridge, Massachusetts, across the Charles River from Boston.
Photo by Gary Roskin
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South Seas Cultured Pearls
South Seas Cultured Pearls -
South Seas cultured pearls are (most commonly) grown by implanting a mother of pearl (MOP) spherical bead inside a...
