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Gemstones - Adamantine Spar
Adamantine spar is a historical name applied to certain varieties of corundum. It was originally used for silky brown corundum displaying a distinctive appearance. Some specimens resembled what later became known as seal sapphire. The material possessed an unusual texture and luster. These characteristics inspired the descriptive name.
Over time, the term acquired a broader meaning. It came to include dull and opaque corundum varieties from India. These materials were not valued primarily as gemstones. Instead, they were often processed for industrial purposes. Their hardness made them useful as abrasives.
Corundum is one of the hardest naturally occurring minerals. Only diamond exceeds it in hardness on the Mohs scale. Because of this property, corundum has long been used in grinding and polishing applications. Industrial-grade material is especially valuable for such purposes. Adamantine spar frequently served this role.
The history of the term reflects changes in gemstone classification and trade practices. Names once applied to decorative materials were sometimes extended to industrial varieties. As gemology became more standardized, terminology evolved. Some older names gradually fell out of common use. Adamantine spar is one such example.
Today, the term is encountered mainly in historical gemological literature. Modern descriptions generally classify the material simply as corundum. Nevertheless, the name remains significant for understanding older references. It illustrates how gemstone terminology has changed over time. Consequently, adamantine spar retains historical importance.
Adamantine spar is a historical name applied to certain varieties of corundum. It was originally used for silky brown corundum displaying a distinctive appearance. Some specimens resembled what later became known as seal sapphire. The material possessed an unusual texture and luster. These characteristics inspired the descriptive name.
Over time, the term acquired a broader meaning. It came to include dull and opaque corundum varieties from India. These materials were not valued primarily as gemstones. Instead, they were often processed for industrial purposes. Their hardness made them useful as abrasives.
Corundum is one of the hardest naturally occurring minerals. Only diamond exceeds it in hardness on the Mohs scale. Because of this property, corundum has long been used in grinding and polishing applications. Industrial-grade material is especially valuable for such purposes. Adamantine spar frequently served this role.
The history of the term reflects changes in gemstone classification and trade practices. Names once applied to decorative materials were sometimes extended to industrial varieties. As gemology became more standardized, terminology evolved. Some older names gradually fell out of common use. Adamantine spar is one such example.
Today, the term is encountered mainly in historical gemological literature. Modern descriptions generally classify the material simply as corundum. Nevertheless, the name remains significant for understanding older references. It illustrates how gemstone terminology has changed over time. Consequently, adamantine spar retains historical importance.
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