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Abstract ▼ AI-Helper

Amethysts in Eonyang Granite of Woolju-Kun, Kyungnam Province are frequently parallelly grown on top of preexisting smoky quartz crystallized on milky and colorless quartz crystals, which, as a whole, resemble "mushroom" in outer appearance. Fluid inclusions in the amethysts may be grouped into (1) ...

Amethysts in Eonyang Granite of Woolju-Kun, Kyungnam Province are frequently parallelly grown on top of preexisting smoky quartz crystallized on milky and colorless quartz crystals, which, as a whole, resemble "mushroom" in outer appearance. Fluid inclusions in the amethysts may be grouped into (1) gaseous inclusions (G>L), (2) liquid inclusions (L>G), (3) $L_{CO_2}$-bearing inclusions (L+G+$L_{CO_2}$), (4) halite-bearing inclusions (L+G+halite), (5) multiphase inclusions (L+G+halite+sylvite${\pm}$opaque mineral). In addition, euhedral K-feldspars and acicular hematite crystals are included in colorless-milky quartz and deep purple-red quartz, respectively. Filling temperatures of each type of fluid inclusions were measured as follows: $320{\sim}560^{\circ}C$ for gaseous inclusions; $100{\sim}290^{\circ}C$ for liquid inclusions; $200{\sim}310^{\circ}C$ for $L_{CO_2}$-bearing inclusions; $300{\sim}430^{\circ}C$ for halite-bearing inclusions; and $370{\sim}430^{\circ}C$ for polyphase inclusions. The finished-gem amethysts from Eonyang may be distinguished from Brazilian amethysts by the difference in filling degree of gaseous inclusions by the presence of hematite aciculae, and of $L_{CO_2}$-bearing inclusions, and also by the absence of Zebra-striation structure. They may also be differentiated from synthetic amethysts by presence of straight color banding, solid inclusions, and $L_{CO_2}$-bearing inclusions which are not found in synthetic materials.