Minerals. Whia , H oll Period 7. Diamond. Hardness: 10 Streak: White Fracture: Conchoidal. Gold. Hardness: 2-3 Color: Golden, butter Yellow Luster: Metallic. Emeralds. Streak: White Hardness: 7.5 - 8.0 Luster: Vitreous Color: Green. Ruby. Color: Red Hardness: 9.0
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