What is a quartz rock composed of?
90937
Silicon Dioxide. SiO2. \n\nQuartz has the exact same composition as common window glass, except window glass is not in crystal form and quartz is crystalline. A crystal is a solid with a consistent and ordered atomic structure. \n\nThe rocks listed above CONTAIN quartz, along with a lot of other minerals, but they are not made entirely of quartz. It is not a latite, or crystalized silicon (which is a metal) or Granite, Rhyolite, Vesicular Rhyolite, or Pumice. Obsidian is silicon dioxide that is like glass- uncrystallized- but it is not quartz.
153831
Pure quartz is clear and translucent, but natural quartz is typically tainted with impurities, and it takes on the color of those. Here are some examples:\n\n# Amethyst's color is due to an iron (ferric, Fe+3) impurity-induced color center\n# Citrine's color is due to an iron (ferrous, Fe+2) impurity-induced color center\n# Milky quartz's color is due to microscopic air, carbon dioxide, or water inclusions\n# Rose quartz's (crystalline) color is due to aluminum and phosphorus impurities - massive rose quartz's color is due to microscopic and, as yet, unidentified dumortierite-like fibers\n# Smoky quartz's color is due to an aluminum impurity-induced color center aided by natural irradiation
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
467927
Calcite is the name for the mineral consisting of a form of CaCO3. It is the main constituent of limestone, a common sedimentary rock formed from the shells of creatures in ancient seabeds.
654586
Igneous rocks-- formed from magma, extrusive or intrusive.  extrusive have small crystal forms ex. basalt, scoria, pumice.  Intrusive large crystals forms ex. granite, gabbro\n\nSedimentary rocks -- the only rocks that contain fossils, formed at the surface, formed from fragments of other things ie. rocks, fossils, woody plants (coal), or minerals crystallizing out of water (limestone) -- Are porous found in aquifers, oil fields.\n\nMetamorphic rocks -- forms from alteration of other rock with increased pressure and/or temperature.  Always in a solid state (they don't melt)called recrystallization, form new minerals that are stable at increased temperature and/or pressure, happens below the earth's surface (at depth).
1124873
You're probably right. It sounds like quartz to me.\n\nIf you have a college or university in town, take it there to the science dept. They will no doubt find it interesting.
1066723
I'm quite sure it's A, extrusive rocks are exposed and cool very quickly.  Since they cool rapidly, crystals have no time to grow, and most crystals are smaller than a millimeter.  Obsidian, in fact, has no crystals at all and is a type of glass.  Intrusive rocks (such as granite) on the other hand, cool slowly (as they are insulated by the earth) and larger crystals form.  \n\nFor further information,\nhttp://www.geology.ufl.edu/Class_Notes/GLY2010_Fall_1996/summaries/intrus1.html\nhttp://www.nps.gov/brca/Geodetect/Rocks%20&%20Minerals/igneous.htm\n\nHope this is helpful.
393590
Well, sedimentary has "sediment" in it. You know, the yucky mud stuff on the bottom of a river or stream. That's what sedimentary rocks are made of.\n\nIgneous looks like ignite, which is to start a fire. Volcanoes have red-hot magma in them, and that's what igneous rocks are formed from.\n\nA metamorphosis is a change from being one thing to being something else (like a caterpillar becoming a butterfly.) Metamorphic rocks are formed when other rocks are transformed by heat and pressure deep withing the earth's crust. \n\nI know you probably wanted some kind of clever mnemonic device, but in this case all you have to do is remember the meanings of three common words.
501423
Igneous rock becomes sedimentary rock by weathering and erosion which makes sediments. The sediments then is deposited and is cemented together to cause sedimentary rock.
331538
3 basic types of rocks\n\nIgneous Rocks-Igneous rocks are crystalline solids which form directly from the cooling of magma. This is an exothermic process (it loses heat) and involves a phase change from the liquid to the solid state. The earth is made of igneous rock - at least at the surface where our planet is exposed to the coldness of space. Igneous rocks are given names based upon two things: composition (what they are made of) and texture (how big the crystals are).\n\nSedimentary Rocks-In most places on the surface, the igneous rocks which make up the majority of the crust are covered by a thin veneer of loose sediment, and the rock which is made as layers of this debris get compacted and cemented together. Sedimentary rocks are called secondary, because they are often the result of the accumulation of small pieces broken off of pre-existing rocks. There are three main types of sedimentary rocks:\n\nMetamorphic Rocks-The metamorphics get their name from "meta" (change) and "morph" (form). Any rock can become a metamorphic rock. All that is required is for the rock to be moved into an environment in which the minerals which make up the rock become unstable and out of equilibrium with the new environmental conditions. In most cases, this involves burial which leads to a rise in temperature and pressure. The metamorphic changes in the minerals always move in a direction designed to restore equilibrium. Common metamorphic rocks include slate, schist, gneiss, and marble.
205251
Granite and most other igneous rocks are made of more than one mineral. In granite you can see the individual mineral crystals, which are often quartz, plagioclase feldspar, and potassium feldspar. In other igneous rocks like basalt the minerals may not be visible to the naked eye. Basalt will included olivine, pyroxene, and plagioclase feldspar in most cases.\n\nSandstone is an example of a rock often made of more than one mineral. In addition to quartz grains, sandstone may contain feldspars and many other minerals. Identification of these minerals can often be used to determine the provenance, or original source of the grains that make up the sandstone. \n\nLimestone is an example of a sedimentary rock that often contains only one mineral. Limestone is sometimes composed of 99.9% calcium carbonate, or by its mineral name, calcite.  In some cases, it will have more than one mineral, and may be a mixture of calcite, aragonite, dolomite, siderite and other carbonate minerals, as well as sometimes having small quantities of quartz grains.
794315
The rocks cycle describes how rocks are formed or change over time.\n\nAll rocks start as magma and cool into igneous rocks.  These are typically eroded into sediments and form sedimentary rocks with cementation and compaction.  These can then be heated and defomed so that minerals change, and these changes form metamorphic rocks.  Metamorphic rocks that are heated so much are eventually turned into magma again so the cycle continues.\n\nThis was only one path on the cycle.  Each part of the cycle is interchangable, and each rock follows its own unique path.  An igneous rock can directly become metamorphic, like in a granitic gneiss, many sedimentary rocks are cycled and recycled dozens of times (e. g. quartzite).  The possibilities are endless.
9262
jasper, opaque, impure cryptocrystalline quartz, usually red, but also yellow, green, and grayish blue. It is used as a gem. Ribbon jasper has the colors in stripes.
469041
Quartz & Feldspar make up most of the abiogenic sands (eroded from rocks).\n\nActually silica (silicon dioxide) & quartz are the same thing.\n\nThe other is feldspar which usually breaks down into clay depending upon the right surface conditions (wet/humid).
788400
quartz. This is not all that magma contains though, It can also have feldspar, garnet, and many other minerals. Quartz is the most common though.
776966
A clastic rock is a sedimentary rock formed of particles deposited by water, wind, ice, gravity.  The particles themselves would give the rock texture--think of the gritty surface of a sandtone. Detrital texture is described by size, shape, and composition or the sorting of the redeposited particles. \n\nA chemical sedimentary rock is formed by precipitating from water solution. They precipate "in place", and are not formed by redeposited particles like clastic rocks. These include evaporites, opal, some carbonates, iron oxides, etc. Stalactites are examples. Dried up lake beds form flat layers of evaporites, another example. Chemical textures are usually crystalline with some special descriptions like pisolitic or  oolitic.\n\nThe category not mentioned is that of biological sedimentary rocks--composed largely of plant or animal material.
832073
Glass is made of sandstone.  Stone would be earth.