crystal forms of the tetragonal system ,tetragonale pyramide ,simple four-sided pyramid aligned with the primary axes. - graphite stone stock illustrationsCrystal Forms of the Tetragonal System ,Tetragonale Pyramide ,simple four-sided pyramid aligned with the primary axes.
a pentagonal icositetrahedron, featuring 24 irregular pentagonal faces. - graphite stone stock illustrationsA pentagonal icositetrahedron, featuring 24 irregular pentagonal faces.
the orthorhombic (rhombic) system ,rhombic pyramid ,double pyramid (dipyramid) where the base is a rhombus rather than a square. common in sulfur crystals. - graphite stone stock illustrationsThe Orthorhombic (Rhombic) System ,Rhombic Pyramid ,double pyramid (dipyramid) where the base is a rhombus rather than a square. Common in sulfur crystals.
a hexagonal scalenohedron, a 12-faced solid common in calcite crystal formations. - graphite stone stock illustrationsA hexagonal scalenohedron, a 12-faced solid common in calcite crystal formations.
an orthodome, a crystalline form specific to the monoclinic system. - graphite stone stock illustrationsAn orthodome, a crystalline form specific to the monoclinic system.
a "flatter" rhombohedron, showing a more obtuse or compressed vertical orientation. - graphite stone stock illustrationsA "flatter" rhombohedron, showing a more obtuse or compressed vertical orientation.
a dyakis dodecahedron (diploids), a 24-faced solid within the cubic crystal system. - graphite stone stock illustrationsA dyakis dodecahedron (diploids), a 24-faced solid within the cubic crystal system.
star tetrahedron ,formed by two interpenetrating tetrahedra. this geometry is often seen in minerals like diamond or fahlore (tetrahedrite). - graphite stone stock illustrationsStar Tetrahedron ,formed by two interpenetrating tetrahedra. This geometry is often seen in minerals like diamond or fahlore (tetrahedrite).
the orthorhombic (rhombic) system ,(macrodiagonal dome / querprisma): a "tent-like" form consisting of two faces parallel to the longer horizontal axis (macro-axis). - graphite stone stock illustrationsThe Orthorhombic (Rhombic) System ,(Macrodiagonal Dome / Querprisma): A "tent-like" form consisting of two faces parallel to the longer horizontal axis (macro-axis).
iron cross twin ,penetration twin formed by two pentagonal dodecahedrons. this is the famous "iron cross" characteristic of pyrite (fool's gold). - graphite stone stock illustrationsIron Cross Twin ,penetration twin formed by two pentagonal dodecahedrons. This is the famous "Iron Cross" characteristic of Pyrite (Fool's Gold).
the orthorhombic (rhombic) system ,(rhombic prism): an elongated four-sided column with a rhombic cross-section. - graphite stone stock illustrationsThe Orthorhombic (Rhombic) System ,(Rhombic Prism): An elongated four-sided column with a rhombic cross-section.
a hemimorphically developed crystal of tourmaline, showing asymmetrical terminations at the top and bottom. - graphite stone stock illustrationsA hemimorphically developed crystal of tourmaline, showing asymmetrical terminations at the top and bottom.
the orthorhombic (rhombic) system ,prisma, brachyprisma u. pyramide: a complex combination crystal showing a primary prism body, side faces of a brachy-prism, and a terminal rhombic pyramid. - graphite stone stock illustrationsThe Orthorhombic (Rhombic) System ,Prisma, Brachyprisma u. Pyramide: A complex combination crystal showing a primary prism body, side faces of a brachy-prism, and a terminal rhombic pyramid.
a "steeper" rhombohedron, showing a more acute vertical orientation. - graphite stone stock illustrationsA "steeper" rhombohedron, showing a more acute vertical orientation.
crystal forms of the tetragonal system ,ditetragonale pyramide: an eight-faced pyramid where each corner of the square base is split into two. - graphite stone stock illustrationsCrystal Forms of the Tetragonal System ,Ditetragonale Pyramide: An eight-faced pyramid where each corner of the square base is split into two.
spinel twin ,contact twin common in the cubic system. two octahedrons are joined on a common plane. this is so characteristic of the mineral spinel that it is officially known as the "spinel law." - graphite stone stock illustrationsSpinel Twin ,contact twin common in the cubic system. Two octahedrons are joined on a common plane. This is so characteristic of the mineral spinel that it is officially known as the "Spinel Law."
prisms combined with rhombohedrons - graphite stone stock illustrationsPrisms combined with rhombohedrons
