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Parallel lines seen on crystal faces or cleavage planes are called growth striations. They are caused by variations in the crystal's growth rate or conditions during formation, resulting in alternating layers of different densities or compositions. These striations can provide valuable information about the crystal's growth history and conditions.
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What are parallel lines seen on either cleavage planes or crystal faces?
Parallel lines seen on cleavage planes or crystal faces are usually caused by twinning, where two crystals grow together with a specific orientation relationship. This twinning can result in repeated patterns of parallel lines that are visible on the surface of the crystal.
What direction is fluorite cleavage?
Fluorite exhibits perfect octahedral cleavage in three directions. This means that it is prone to breaking along flat surfaces parallel to the crystal faces of an octahedron.
What is the cleavage to barium?
Barium is an element which does not occur in pure (native) form on Earth. The two most common minerals in which barium occurs are Barite (BaSO4) and Witherite (BaCO3). According to its entry on wikipedia, Barite has Perfect cleavage parallel to base and prism faces: {001} Perfect, {210} Perfect, {010} Imperfect. I am unsure what sort of cleavage Witherite has.
What kind of faces are found in mineral crystals?
Mineral crystal faces of varying luster and geometric shapes.
Why does rose crystal and smoky crystal exhibit no crystal?
Rose quartz and smoky quartz are considered crystaline minerals due to their internal atomic arrangement, but they do not exhibit visible crystal faces because they often form in massive or granular structures rather than distinct crystal shapes. This lack of well-defined crystal faces is due to the specific conditions under which these minerals are formed in nature.
What are parallel lines seen on either cleavage planes or crystal faces?
Parallel lines seen on cleavage planes or crystal faces are usually caused by twinning, where two crystals grow together with a specific orientation relationship. This twinning can result in repeated patterns of parallel lines that are visible on the surface of the crystal.
What is the difference between the crystal faces and cleavage faces?
Crystal faces refer to the natural faces that develop as a crystal grows, showcasing the crystal's geometric shape and symmetry. Cleavage faces, on the other hand, are the flat surfaces along which minerals tend to break when subjected to stress, revealing the internal structure of the mineral.
What is the cleavage of fluorite?
Fluorite has four perfect cleavage planes that are parallel to the faces of an octahedron. This results in the mineral breaking into octahedral fragments when cleaved.
What property causes the mineral galena to break into tiny cubes?
The property that causes galena to break into tiny cubes is its cleavage. Galena exhibits perfect cubic cleavage, meaning that when struck or broken, it tends to break along smooth, flat planes that are parallel to the cube faces of the crystal structure.
Why do halite crystals always break into smaller crystals of the same shape?
Halite crystals break into smaller crystals of the same shape due to the crystal structure and cleavage of the mineral. Halite has a cubic crystal structure and perfect cubic cleavage, which means it breaks along planes that are parallel to the faces of the cube, resulting in smaller crystals with the same cubic shape.
Does a tetrahedron have parrallel faces?
No. The faces of a tetrahedron are equilateral triangles, but none of the faces is parallel to another one of the faces -- they could not be parallel, since by the definition of a tetrahedron, all the faces intersect(!) and parallel planes do not intersect.
Are Two planes parallel to a line parallel?
No. Consider two adjacent faces on a cuboid. Both planes are parallel to the edge at which the intersect. But the fact that they do intersect illustrates that they are not parallel.
Does a dodecahedron have parallel faces?
A dodecahedron is a polyhedron with 12 faces, each of which is a regular pentagon. In a dodecahedron, the faces are not parallel to each other. The planes of the faces intersect at various angles, giving the dodecahedron its unique shape and properties.
Can planes be parallel?
Yes. The opposite ends of any right prism consists of two congruent and parallel faces. Two planes are parallel if the vertical distance between them is always the same.
What are pairs parallel faces?
In a polyhedron - a 3-dimensional object - a pair of parallel faces are two faces which lie in planes that are parallel to each other.Parallel faces need not be congruent. For example, consider a pyramid whose top is sliced off by a plane parallel to it base. The flat top and the base will be parallel faces but will not be congruent.
Why do some minerals break by fracturing?
Minerals can have a cleavage plane, multiple cleavage planes, or no cleavage plane. A cleavage plane is an area of weakness in the crystalline structure where the mineral is prone to splitting.
How rapidly does Quartz vibrate?
Quartz vibrates when a voltage is applied between opposite faces of a crystal. The frequency of the vibration depends on the thickness of the crystal, and on the direction of the faces compared to the natural planes in the crystal structure.
