The Encyclopedia of Gemstones and Minerals by Martin Holden (1991)
The Encyclopedia of Gemstones and Minerals by Martin Holden (1991) This work offers information on the properties/values of over 200 rocks, stones, jewels and other natural substances. From amber to zinc, and from diamond-edged blades to orthoclase-based porcelains, details about characteristic form, specific gravity, symmetry system, refraction, location, use and commercial value are provided. Also … Read more
