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Home > Banded Amethyst

Banded Amethyst

Banded Amethyst

Banded Amethyst

Banded Amethyst tumbled

A species of Quartz

Known as the birthstone of February, banded Amethyst is a polished, semi-precious stone that is prized for its alternating bands of purple and white. This gem is actually a combination of Amethyst and pure Quartz and it's also known as Chevron Amethyst. Some portions are translucent.

General Info About Banded Amethyst

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Physical Properties of Banded Amethyst

Colors

Lavender (light purple), Purple, White

Streak

White

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Chemical Properties of Banded Amethyst

Formula

SiO₂

Elements listed

Si, O

Common Impurities

Fe

Optical Properties of Banded Amethyst

Refractive Index

1.544-1.553

Birefringence

0.009

Pleochroism

Weakly dichroic

Dispersion

0.013

Optical Character

Biaxial positive

Characteristics of Banded Amethyst

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Serpentine tumbled

Tumbled serpentine tumbled is a mottled green or yellow color with black inclusions. It often has a waxy luster, although sometimes a glassy finish is achieved. Serpentine tumbled is found across the world but specifically the USA, Greece, Peru, and India. It is often made into beads and cabochons for jewelry, and cut for sculptures or ornamental pieces.

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More popularly known as citrine, yellow Quartz was first appreciated in the Greek Hellenistic Age over two thousand years ago. It is an alternative birthstone for the month of November, although that position is more usually filled by topaz (which is visually similar to citrine). Traces of iron are responsible for this stone's yellow tint.

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Hackmanite is a sodalite variety first discovered in Greenland but now mined in several localities around the world. The material is pale to deep purple when first mined, but it fades upon exposure to sunlight. This change can occur in seconds, but the original color can be obtained again when the material is placed into a dark place. Hackmanite is used as a collector's gem, usually cut into slices or slabs or faceted into ovals.

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Sodalite tumbled

Sodalite tumbled is a beautiful deep blue, reminiscent of Lapis Lazuli. It can be veined with white or silver. Significant sources of sodalite tumbled are found in Greenland, Namibia, North America, and Russia. It is used for a range of jewelry items such as earrings, brooches, and beaded necklaces. It is also made into cabochons and ornamental figures.

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The obscured transparency in white Quartz is due to trace amounts of gas or liquid trapped during the crystal's formation. Although very common, its milky opaqueness renders it relatively valueless for optical and aesthetic purposes. Because it is sometimes found alongside gold veins, prospectors are cheered to sight it in mines.