A strange and pretty mineral specimen out of the Sussman Collection, which is notable for its fine Namibian suite of minerals. This is a pseudomorph of limonite after a compound crystal of razor-sharp siderite, showing staggered rhombohedral forms. On the front face, you can see slender crystals of red rutile embedded in the face of the crystal! The specimen is actually light in the hand, as it is basically the same as rust chemically - though a whole lot prettier and obviously a significant and unusual enough specimen for the Sussmans to have in their collection. Sharpest crystal seen in a pocket they bought about 4 years ago.