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Rocks and Minerals

A rock is a compound composed of two or more minerals. It is classified into three types based on how it is formed – igneous, sedimentary and metamorphic. Meanwhile, a mineral is grouped in classes based on its chemical properties.

17,818 Questions
Geology
The Difference Between
Rocks and Minerals

What is the difference between a rock and a mineral?

A rock is composed of combinations of minerals, each mineral having its own chemical formula and crystalline structure. Minerals are composed of an element or combination of elements. Granite, for instance, is an intrusive igneous rock composed ofthe minerals quartz, feldspar, mica, hornblende, and other combinations or ratios of minerals.

A mineral is a naturally-occurring inorganic (there are some exceptions to this) crystalline solid (though mercury is regarded as a mineral) with a specific chemical composition and a characteristic internal regular geometric arrangement of atoms, sometimes expressed as natural crystal faces.

A rock is an aggregate of one (such as quartzite) or more (such as granite) mineral particles formed through either crystallization of molten magma (igneous rocks), settling of particles (sedimentary rocks), or reheating and pressure applied to pre-existing rocks (metamorphic rocks), with no set chemical composition or atomic structure.

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Animal Life
Rocks and Minerals

What are some objects made of minerals you can find in your classroom?

Well, almost everything contains minerals in some way shape or form, but direct minerals would be graphite in a pencil, stone tiles, whatever metals, etc.

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Rocks and Minerals

What are the five defining characteristics of minerals?

To meet the definition of a mineral, a substance must be an inorganic, naturally occurring solid, with a set parameter of chemical formulas and a crystalline structure.

Non-defining physical properties or characteristics of minerals include: hardness, luster, cleavage, crystal structure, chemical formula, streak, radioactivity, refraction, magnetism, and pleochroism.

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Rocks and Minerals
Soil

Difference between loamy and sandy soil?

Loamy soil has a higher clay content, and usually is easier to maintain organic matter content.

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Geology
Rocks and Minerals

6 methods to tell minerals apart?

Six methods to tell minerals apart?

1) Acid test = will it bubble? is there a light, strong, or no reaction to the acid 2) color= white, black, green, pink, or gold 3) streak= black. Brown. White. Red. This tests the powder color of the mineral 4) luster= dull, pearly, shiny 5) weight = gravity test 6) hardness= this is a scratch test mineral against a penny and a file.

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Chemistry
Mining
Elements and Compounds
Rocks and Minerals

What is pyrite's formula?

Pyrite is an iron ore, which has the chemical formula FeS2 (Iron (II) Sulfide)

The sulfide ion present is S22-

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Rocks and Minerals

How do particles in rocks fit together?

They stick to each other over time

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Geology
Rocks and Minerals

Is limestone the hardest rock?

No, far from it. Limestone is actually quite soft, rating only a 3 or 4 on the Mohs scale.

Care should be taken when making generalisations about rock properties.

Hardness is a function of a material's elastic modulus (how much it deforms under a given load).

Limestone (like all rocks) is a natural Earth material. As such it can display a very large variability in properties.

For example limestones can have Young's modulus values ranging from 9 to 70 MPa.[A] This is clearly very variable, but the upper bound values are comparable with values derived for "hard" rocks such as metamorphic hornfels and the coarser grained igneous rocks such as granite, whereas the lower bound values are very soft indeed by rock standards.

So to answer the question, no, limestone is not the hardest rock, however some types of limestone can be classed with some of the hardest rocks, whereas other types may be some of the softest.

[A] Bell, F. G. (2007). Basic Environmental and Engineering Geology. Dunbeath, Whittles Publishing Limited.

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Earth Sciences
Rocks and Minerals

What elements compose Pyrite?

Nothing, except Fe-Iron and S-Sulfur,

Pyrite is a sulfide mineral of Iron

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Rocks and Minerals

What is the softest rock to hardest rock?

the softest rock is talc and the hardest is a diamond

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Rocks and Minerals

What is an unrefined mineral?

ore

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Mining
Rocks and Minerals

What is the value of beryl?

The value of beryl is highly variable. At the bottom would be ore-grade beryl, worth whatever the going rate of beryllium is. At the top would be gem-quality emerald, one of the most precious of all gems, worth thousands of dollars per carat.

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Rocks and Minerals

How do chemical precipitates rocks form?

Precipitates rocks are formed from the simple process of precipitation.

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Rocks and Minerals

Where are amethyst minerals found?

The crystalline mineral amethyst is a variety of quartz and may be found in situ (in place in the rock it was formed in) in small cavities called Vughs mainly in rocks of volcanic origin. This is not very helpful if you want to find them easily. perhaps the best place to find them easily is on the seashore, where amethyst pebbles can often be found where streams have intersected volcanic rocks on their way to the sea and washed down the amethysts onto the gravelly beach deposits.

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Geology
Chemistry
Rocks and Minerals

Does quartz have a high or low boiling point?

Quartz has a high boiling point. This mineral is essentially an oxide of silicon, SiO2, and it boils at over 2200°C.

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Quartz melts at normal atmospheric pressure at about 600 OC, which is why high silica content rocks - such as granite, rhyolite, obsidian etc., are highly viscous, whereas basalt which contains NO FREE QUARTZ - all the quartz forms silicates such as olivine, plagioclase feldspar and mica are of a lower viscosity, can flow long distances and freeze at about 1100 OC.

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Science
Meteorology and Weather
Rocks and Minerals
Water Cycle

What are the advantages of cycle of sedimentation?

the study of cycle of sedimentation and sedimentary rock has great practical value as well. Oil and gas, our most valuable sources of energy are found in these rocks. These precious resources are becoming increasingly difficult to find, and so it's more important than ever to understand how sedimentary rocks which is known as sedimentation cycle. As oil and gas decline in abundance, coal which is a distinct type of sedimentary rock will be use increasingly to generate energy. Another important energy source that may accumulate in sedimentary rock is uranium, which is for nuclear power. Phosphate rock used for fertilizer is sedimentary, as is much of the world's iron ore. Knowing how these kinds of sediment form or sedimentation cycle can help us to find and use these limited resources. May my answer can help you.

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Erosion and Weathering
Rocks and Minerals

What are some types and examples of erosion?

Where the ocean and land meet is a constant erosion.

The beach!

My answer: The Grand Canyon is a good example. It used to have a river in it, and over a long period of time erosion and deposition combined to form it :)

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Geology
Rocks and Minerals
Metamorphic Rock

Is granite organic rock?

Granite is commonly classified as an igneous rock, one that was formed from cooling magma below the surface of the earth (intrusive). Igneous rock formed from lava erupted at the earth's surface like basalt are called extrusive.

Neither of these rocks would be called organic as they were not formed from things that were once alive. Coal could be called organic as it was formed originally from plant material.

Chemistry is typically divided into Organic and Inorganic and in this sense, Organic refers to reactions involving the element Carbon.

Organic is a term also used in connection with food, where it is generally used to refer to food grown or produced without use of pesticides or artificial fertilisers

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Rocks and Minerals

What is the average silica content for granite?

72%.

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Geology
Mining
Rocks and Minerals

What is quartz used for?

Quartz is used in the making of sandpaper, optics, glass, liquid filters, circuit boards, computer components, cement , mortar, and jewelry. Quartz crystals are also piezoelectric meaning when an electrical current passes through them they vibrate a small amount. Time can be measured from the vibrations of the quartz crystals so quartz crystals are often used in clocks.

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Jokes and Riddles
Earth Sciences
Rocks and Minerals

What does canyon mean?

A deep narrow steep-sided valley formed by a river in the place where there is little rainfall .

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Acids and Bases
Rocks and Minerals

Does gneiss react to acid?

Depending to the acid concentration but I'd suppose that it is rather inert to acid.

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Geology
Rocks and Minerals

What must occur for sedimentary rock to form?

Compactment, Cementation, and Lithification.

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Ceramics and Pottery
Rocks and Minerals

What do you call the tendency of a mineral to break along curved or irregular lines?

A mineral that breaks into relatively straight lines and faces is said to possess cleavage, if it breaks into irregular or curved surfaces, the term is fracture, eg the conchoidal fracture of quartz or obsidian.
When minerals break unevenly, there is FRACTURE.
Fracture..... the one with the smooth tendency is called cleavage
this is called fracture when a mineral breaks into jagged pieces and it is called cleavage when it breaks smoothly

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Erosion and Weathering
Rocks and Minerals

How can plants help stop soil erosion?

the roots help keep the soil steady and prevent them from falling into the water source

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