Plate 14
Crystal forms of hematite, A the rhombohedron with the edges beveled; B the tabular form, resulting from the excessive development of the two o faces opposite each other
A typical crystal of magnetite
The rhombohedron typical of siderite
Crystal forms of hematite, A the rhombohedron with the edges beveled; B the tabular form, resulting from the excessive development of the two o faces opposite each other
A typical crystal of magnetite
The rhombohedron typical of siderite