Pyrolusite
Cercal do Alentejo, Santiago do Cacém, Setúbal, Portugal
In most pyrolusite specimens the crystals lie flat along the matrix, but this specimen features a thick brushy growth of free-standing needles. The crystals have a good gray submetallic luster, and reach about 1 cm in length.
Specimen size: 3.7 x 2.7 x 2.2 cm (1.5 x 1.1 x 0.9 inches)
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