MN833 Sample ID MN833 • Cabinet K Chalcedony 14.6cm W x 11.5cm H x 4.3cm D • 4.34g Sample TypeMineralColorBlue, White, Rusty, BrownLusterEarthy StreakWhiteCleavage/FractureIrregular/CutSpecific Gravity1 Geographic Location/Date Mohs Hardness 7 This striking specimen features a coral structure replaced by quartz over time. The hollow interior reveals botryoidal crystal growth in soft white and pale blue, forming rounded, geode-like textures. The cut surface exhibits glassy quartz banding, while the exterior ranges from bluish tones to iron-rich rusty reds. Description of Mohs scale here