Heliodor is a member of the beryl family. This stone is known for its range of yellow colors: from pale yellow, greenish-yellow, orange-yellow, to a deep golden orange. Heliodor can be faceted for use in jewelry.
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|Is a Variety of||Beryl|
|Alternate Common Names||Golden Beryl|
|Colors||Greenish yellow, yellow, yellowish-orange|
|Hardness||7.5 - 8|
|Stone Sizes||See Below|
|Formula||Be3Al2Si6O18 + Fe3+|
|Pleochroism||Less distinct than the other beryls. Brownish-yellow to lemon-yellow.|
|Etymology||From the Greek helios and doron for "gift of the sun," in allusion to the yellow color.|
|Occurrence||Granitic rocks, especially granite pegmatites.|
|Inclusions||Long, hollow tubes, negative crystals, chrysanthemums.|
Green beryl is sometimes misidentified as heliodor. (Editor’s Note: some gemologists, notably Walter Schumann, reject heliodor as a distinct variety of beryl and consider it a weak-colored golden precious beryl).
- Madagascar: gemmy crystals
- Brazil: greenish yellow to fine deep orange colored material, much of it gemmy.
- Namibia: in pegmatites.
- Connecticut: small but fine colored crystals, some gemmy.
- British Museum (Natural History) (London England): 82.25 (yellow)
- Royal Ontario Museum (Toronto, Ontario, Canada): 77.8 (yellow, step cut, Brazil)
- Smithsonian Institution (Washington, DC): 133.5 (yellow, Madagascar); 43.5 (golden catseye, Madagascar); 17.5 (yellow, Russia)
Consult our gemstone care guide for recommended cleaning methods.