Probertite Lang Mine, Tick Canyon Borate deposit, Tick Canyon, Lang, Los Angeles, California, USA Dimensions: 4.1 x 3.8 x 2.1 cm
Comes with original old tag.
A very characteristic old-locality example of probertite, presenting as dense sprays and radiating bundles of silky white to colorless acicular crystals across a contrasting dark brown matrix. The individual fibers converge into flattened fans and rosette-like aggregates.
That habit is particularly appropriate forLang Mine probertite. Material from this locality has been described as compacted rosettes of coarse needles and lenticular aggregates of slender radiating prisms—a very good match for what is visible here.
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