"Diaspore /\u02C8da\u026A\u0259sp\u0254\u02D0r/, also known as empholite, kayserite, or tanatarite, is an aluminium oxide hydroxide mineral, \u03B1-AlO(OH), crystallizing in the orthorhombic system and isomorphous with goethite. It occurs sometimes as flattened crystals, but usually as lamellar or scaly masses, the flattened surface being a direction of perfect cleavage on which the lustre is markedly pearly in character."@en . . . . "Diaspore"@en .