Each mineral has a unique crystal shape because of what?
103373
The atomic and molecular structure of each mineral determines the crystal shape. Each mineral is composed of a specific molecular compound, and those molecules arrange themselves in an ordered fashion based on their structure that will form a crystal.  \n\nThese regular and repeating groups of molecules and atoms form a unit that is known as a lattice. There are 14 lattice groups (Bravais lattices), which fall into six (some crystallographers use seven) different crystal systems. Each crystal system includes the different rotation and reflection symmetries around a fixed lattice point. \n\nTo make this all more confusing, and to the horror of most mineralogy students there are also 32 different crystal classes. Each crystal class is a different and unique set of symmetrical forms.\n\nTo see illustrations of Bravais Lattices go here:\nhttp://hyperphysics.phy-astr.gsu.edu/hbase/solids/bravais.html\n\nFor a more detailed explanation go here:\nhttp://dave.ucsc.edu/myrtreia/crystal.html#INTRO
149062
The question is not clear.  Are you asking what a crystal is?  Are you asking what the different crystal structures are?  Are you asking for the characteristics of crystals in general?
914315
Andalusite is a polymorph with two other minerals; kyanite and sillimanite. A polymorph is a mineral that shares the same chemistry but a different crystal structure with another, or other, minerals. A unique variety of andalusite is called "chiastolite". It contains black or brown clay and/or carbonaceous material inclusioned in the crystal. These inclusions are arranged in regular symmetrical shapes. Usually they are in the form of a cross or X. \n\nPHYSICAL CHARACTERISTICS:\nColor is white, red, brown, orange and green. \nLuster is vitreous. \nTransparency crystals are transparent to translucent. \nCrystal System is Orthorhombic; 2/m2/m2/m \nCrystal Habits include prismatic crystals with a square cross section terminated by a pinacoid. also massive and granular. \nCleavage is good in two directions. \nFracture is splintery to subconchoidal. \nHardness is 7.5 \nSpecific Gravity is approximately 3.15+ (above average) \nStreak is white. \nAssociated Minerals are cordierite, biotite, feldspars, quartz, kyanite and sillimanite. \nOther Characteristics: dark inclusions produce cruciform shapes in the variety, chiastolite. Index of refraction is 1.632-1.638. \nNotable Occurrences include Andalusia, Spain; Austria; California, USA and China. \nBest Field Indicators are crystal habit, color, inclusions (if present) and hardness.
314284
The reason why crystals in plants vary in the plant cell is because of the plant defense. The crystals will vary according to the biome which the plant resides in. \n\n\n\noh yeah I am studying Botany
606550
"A mineral is an element or chemical compound that is normally crystalline and that has been formed as a result of geological processes" (Nickel, E. H., 1995).\n\nA rock can be composed of lots of different minerals
798171
1) Rhyolites that cool too quickly to grow crystals form a natural glass or vitrophyre, also called obsidian\n\n2) amount of silica di-oxide, texture and color\n\n3) gold is found in quartz veins around igneous intrusion via hydrothermal fluid precipitation\n\n4) If we assume a slower but constant rate of cooling, then both minerals could feasibly form well shaped crystals at the same time (phaneritic texture) .  If we assume a slow than fast cooling, then possibly only plagioclase would form (porphyritic texture) due to its position in Bowen's reaction series.
609399
Streak, I would say, based on the following:\n\nPhysical properties commonly used are :\n\nCrystal structure and habit: A mineral may show good crystal habit or form, or it may be massive, granular or compact with only microscopically visible crystals. \nHardness: the physical hardness of a mineral is usually measured according to the Mohs scale of mineral hardness. \nLuster indicates the way a mineral's surface interacts with light and can range from dull to glassy (vitreous).\nStreak refers to the color of the powder a mineral leaves after rubbing it on an unglazed porcelain streak plate.\nCleavage describes the way a mineral may come apart or cleave in different ways. In thin section, cleavage is visible as thin parallel lines across a mineral.
298058
Agate is a type of the mineral family chalcedony --\nJasper is a type of the mineral family quartz --\n\nSee this website for pictures -->http://www.mindat.org/min-2082.html\n\nGod is spelled B-I-G  B-A-N-G\n\nPBrax@netscape.com
330211
They have a chemical structure which causes it to stay thick (viscous). The first crystals to form as a silicic magma cools slowly are pyroxene, amphibole, and feldspar. In pyroxene, silica tetrahedra (SiO4) form long chains. In amphiboles, silica tetrahedra form double chains. The pyroxene and amphibole crystals that are beginning to form become entangled so the magma becomes viscous.
381199
that'll be chalcedony. it differs from quatrz in it's shape, as it usually occurs in botryoidal masses, whereas quartz occurs more in hexagonal prisms. chalcedony is similar to opal, but can be distinguished by its higher specific gravity. it can be formed as a dehydration product of opal, hence the connection. the colour is highly variable, as it can be white, blue, red, green, brown or black, and varieties of chalcedony include jasper, agate, chrysoprase, onyx and carnelian. it's formed in rock cavities, especially lavas, and it develops at relatively low temperatures, whereas quartz occurs in any rock type, and usually formed at higher temperatures
587464
Rock is a naturally occurring aggregate of minerals and/or mineraloids. Rocks are classified by mineral and chemical composition; the texture of the constituent particles; and also by the processes that formed them. These indicators separate rocks into igneous, sedimentary, and metamorphic.\n\nMinerals are natural compounds formed through geological processes. The term "mineral" encompasses not only the material's chemical composition, but also the mineral's structure. Minerals range in composition from pure elements and simple salts to very complex silicates with thousands of known forms (organic compounds are usually excluded)
618529
The chemical composition of diferent minerals is what makes them different colors.  This is why jade is green, sapphires (my birthstone) are blue, rubies are red, etc.   This is also whay there are color variations within different types of the same mineral (yellow diamonds, colorless diamonds, etc.)
464891
Gemstone quality crystals can be made into jewellery and so are vauable. Others are useful for their ores (hematite Fe2O3 iron ore, malachite copper ore etc.) I also heard somehing about using crystals for resonance but I'm not sure what that means lol hope this helps\n\nP.S. Quartz ie. silicon used for glass
750126
The best answer is C. Minerals are inorganic, have a definite homogeneous chemical structure, are solid and have a crystalline structure formed by geologic processes.
63207
You can make a crystal by combining diff. elements...\n\ne.g:\ncombining carbon, hydrogen and oxygen will result to glucose molecules which will made up to SUGAR CRYSTALS.\n\nI think these are some of the diff. kinds of crystals...\n\nIceland SPar\nAlbite, orthoclase, pyrite, apophylite, anhydrite, quartz...
749688
1. yes they occur in the cracks of rocks but not just metals .. for example quartz is not a metal but it can form veins .. Veins are mineral deposits which form when a fracture or fissure within a larger body of rock is filled with new crystalline material. Veins are believed to form when aqueous solutions migrate through fissures in rock and deposit minerals onto the fissure walls. \n\n2. Ilmenite is a crystalline iron titanium oxide (FeTiO3).\nwhile rutile is a mineral composed dominantly of titanium dioxide, TiO2 so its not an iron ore !!
297172
The stability of individual minerals, or combinations of minerals is governed by the energetics of the minerals themselves.  More specifically, it is governed by the thermodynamics of the minerals or the possible combinations of minerals that may form from the chemical elements present.  In essence, thermodynamic principles require that the most stable state of any chemical system be the state characterized by the lowest possible Gibbs Free Energy (G).  Reduced to the simplest of terms, G represents a combination of the "heat content" or enthalpy (H) of a mineral phase (or assemblage of phases), and the product of temperature and entropy (S)  [G = H-TS].  The most stable state of a system is the one with the lowest Gibbs Free Energy.  It turns out that both H and S are functions of temperature and pressure, consequently G is dependent on P and T, and hence mineral stability is strongly controlled by temperature and pressure.