In its pure form, calcite can be white or colorless, but often contains impurities or trace elements. These can affect its color, giving it a range of hues, including blue, green, red, lavender ...

The lowest-quality lapis looks dull and green, the result of an excess of pyrite. Lapis with white calcite streaks is less valuable. Although many people associate lapis with dark blue, it’s also ...

The lowest-quality lapis looks dull and green, the result of an excess of pyrite. Lapis with white calcite streaks is less valuable. Although many people associate lapis with dark blue, it’s also ...