A plate of quartz points, in a few places rendered dark brown red by inclusions of hematite, with a generous coating of gray brown siderite (or less likely, dolomite) crystals to a few mm which have been replaced by goethite. (Not siderite because these replacements survived treatment with hot oxalic acid.) Minor, gray hematite is also seen on the surface of the quartz. Sits nicely for display without needing a stand. Nice condition. Illustrated on page 275 of my new book Mineral Specimen Cleaning and Development for the Amateur.