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Halloysite: Al2Si2O5(OH)4 Pseudomalachite: Cu5(PO4)2(OH)4
Comments: Deep green pseudomalachite crystals on cuprous halloysite.
Location: Black Pine Mine, Philipsburg, Granite Co., Montana, USA.
Scale: Crystal size 1-2 mm.
© John Veevaert
Comments: Pale tan sectile porcelaneous massive halloysite.
Location: Monroe County, Indiana, USA.
Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species