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rocks and minerals
Transcript of rocks and minerals
Sedimentary Rock There are 8 properties of rocks
These 8 are:
crystal form, luster, color, streak, hardness, cleavage, fracture, and specific gravity. Here are some! Specific Gravity - Using the ratio of the weight of a mineral to the weight of an equal volume of water to determine what mineral it is. For example if a mineral weighs 5 times as much as an equal volume of water then its specific gravity is 5.
Crystal Form - Each mineral has a distinct crystalline structure within it. By identifying the crystal structure of a mineral you can narrow down the types of mineral it could be. There are about 64 different types of structures that are broken down into 6 groups.
Isometric - equal measure
Tetragonal - square cross sections with rectangular faces
Hexagonal - six sided
Orthorhombic - rectangular faces and profile
Monoclinic - rectangular faces and trapezoid faces
Triclinic - trapezoid faces
Like cleavage there are many terms used in defining crystal forms.
Crystal Face - the flat surface of a mineral
Crypto crystalline- crystals in a mineral to small to see with the naked eye
Amorphous - non-crystalline; due to rapid cooling Crystals Gemstones Minerals Mineral - A naturally occurring inorganic compound with a specific chemical makeup and a defined crystal structure Rocks and Resorces http://ekengrenmeowser.blogspot.com/2012/12/apex-minerals.html Were in the World www.rocksandco.com Properties of rocks www.docstoc.com www.greatamericancoincompany.com
Australian Tiger's Eye
Ruby in Zoisite
Blue Opal (Peruvian)
Opal, Boulder Opal
Zircon Sedimentary rocks are fragments of already existing rocks Industrial dimonds are mostly used in cutting, grinding, drilling, and polishing procedures. They are transported by glaciers, wind, and graviy They are transported by glaciers, wind, and graviy
Sedimentary rocks are deposited into: deserts, lakes, river beds, swamps, deltas,and oceans According to the Mineral Information Institute, it is estimated that in a lifetime,
a person living in North America will use up the following quantity of rocks and minerals:
lead - 365 kg
aluminum - 1633 kg
iron - 14 863 kg
copper - 680 kg
clays - 12 068 kg
salt - 12 824 kzinc - 340 kgg (because of all of that road salt during our cold winters!)
stone, sand, gravel & cement - 562-773 kg campfire.andycamper.com http://archive.d83.org/Teachers/wdmedia/wdmedia/gradelevel/4/rocksminerals/rocks.jpg http://img.ehowcdn.com/article-new/ehow/images/a07/9r/5c/rock-mineral-types-1.1-800x800.jpg http://www.rocksforkids.com/images/agate%209%201003.jpg Igneous rocks are rocks formed by cooling magma.
There are two types of Igneous roks that are called Intrusive and Extrusive.
Intrusive- They are created inside the earth and cool at a very slow rate.
Extrusive- Are located at the surface of the earth and cool very fast. www.oldearth.org www.pdesas.org http://flexiblelearning.auckland.ac.nz/rocks_minerals/rocks/images/gneiss2.jpg Metamorphic rocks are rocks changed over time by pressure, heat, and chemical activity.
There are 4 different types of change.
Contact- Changed by heat from magma.
Reginal- Changed by intense heat and pressure.
Hydrothermal- Changed by chemical change and liquid heat that seeps into the fractures in the rock. A gemstone is a mineral, rock, or organic material that is used for jewelry, ornamentation, or art. geology.com http://www.thehouseofcrystals.com/img/image-4.jpg Color Color is a physical property, it is difficult to identify rocks just by colour.Mostly because a lot of rocks have just about the same color. Chemical Impurities and exposer to heat change the color of rocks and minerals. They either tarnish or oxidize the rocks.In opaque minerals, the color tends to be more consistent.Translucent to transparent minerals have a much more varied range of color due to the presence of trace minerals. Luster Luster is a property of rocks to determine how the light reflects off the rock's surface. Rocks that have metal in them are usually more shiney, luster can alter the results of color because of the reflection. Diamonds and other jewls have distinct luster. Density Looks can be decieving, if to rocks look the same they dont always have the same density. If you pick up the same sized quartz and galena, the galena has a high density and would weigh around three times of the quartz.