Difference between revisions of "Heliodor"
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* Hexagonal crystal system. Crystals are generally flawless | * Hexagonal crystal system. Crystals are generally flawless | ||
| − | * | + | * Fracture = conchoidal |
| − | * | + | * Luster = vitreous |
| − | * May contain inclusions | + | * Fluorescence = generally inert |
| + | * Pleochroism = weak; greenish yellow and yellow or two shades of yellow | ||
| + | * May contain inclusions | ||
{| class="wikitable" | {| class="wikitable" | ||
| Line 21: | Line 23: | ||
|- | |- | ||
! scope="row"| Density | ! scope="row"| Density | ||
| − | | 2. | + | | 2.72 g/ml |
|- | |- | ||
! scope="row"| Refractive Index | ! scope="row"| Refractive Index | ||
| − | | 1. | + | | 1.577 - 1.583 |
| + | |- | ||
| + | ! scope="row"| Birefringence | ||
| + | | 0.005 - 0.009 | ||
|} | |} | ||
Revision as of 13:26, 21 December 2022
Description
A golden yellow Beryl stone most commonly found in southwest Africa. Heliodor has been used for Roman intaglios and gemstones.
Golden beryl from [ http://www.g-empire.de Empire of the World of Gems]
Synonyms and Related Terms
golden beryl; yellow beryl; Heliodor (Deut.)
Physical and Chemical Properties
- Hexagonal crystal system. Crystals are generally flawless
- Fracture = conchoidal
- Luster = vitreous
- Fluorescence = generally inert
- Pleochroism = weak; greenish yellow and yellow or two shades of yellow
- May contain inclusions
| Mohs Hardness | 7.5-8.0 |
|---|---|
| Density | 2.72 g/ml |
| Refractive Index | 1.577 - 1.583 |
| Birefringence | 0.005 - 0.009 |
Comparisons
Properties of Common Gemstones
Resources and Citations
- Gem Identification Lab Manual, Gemological Institute of America, 2016.
- Mineralogy Database: Beryl
- Jack Odgen, Jewellery of the Ancient World, Rizzoli International Publications Inc., New York City, 1982
- Wikipedia: Beryl (Accessed Oct. 18, 2005 and Dec 2022)
- Thomas Gregory, The Condensed Chemical Dictionary, Reinhold Publishing, New York, 3rd ed., 1942
- G.S.Brady, Materials Handbook, McGraw-Hill Book Co., New York, 1971 Comment: p. 101