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RM2990 Alumohydrocalcite and siderite
CaAl2(CO3)2(OH)4·4H2O
Globular and radial aggregates of alumohydrocalcite crystals, white to cream in color and with a silky luster. They contrast on the brown siderite. They come from this classic French mine, nowadays partially restored. 6t191i
Size: 4.4 x 4.1 x 1.4 cm.
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