蠟石(Ceraphite或Chaoite)是第四種碳的同素異形體,也稱作白碳。它的存在是有爭議的。蠟石在1969年發現,是人類所知最軟的純物質之一。當在游離蒸發環境下加熱至超過2,550絕對溫度時,會在不透光的石墨晶體面邊緣形成小而透明結晶即為蠟石。此外,蠟石本身為雙折射的透明材料。當前對此同素異形體衹有非常少的資訊。[1]

該礦物以任職於美國地質調查局的華人地質學家趙景德(Edward Ching-Te Chao)命名。[2]

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