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How can you identify igneous rock?
Igneous rock usually appears with a well mixed texture without fossils, bands or layers, may contain vesicles (air bubbles or holes from trapped gases) and does not react with dilute acid.Igneous rocks can:Be glassy or frothy in appearance.Be felsic, intermediate, mafic, or ultramafic in nature.Be porous or full of bubbles.Have large crystal structure like granites.Have small crystal structure like basalts.Have a combination of large and small interlocked crystals.Be more dense than other rock types.Have an interlocking crystalline structure.Appear to be peppered with black specks.Be light enough to float (pumice).
What mineral cannot be scratched by another mineral?
A diamond. Actually, a diamond can be scratched my other minerals.
How is zircon used to date igneous rocks?
Zircon contains uranium which decays into lead at a known rate. By measuring the amount of uranium and lead in zircon crystals in igneous rocks, scientists can calculate the age of the rock based on the ratio of these elements. This method is known as uranium-lead dating and is commonly used to date the crystallization of igneous rocks.
Where can one purchase mineral specimens?
There are many places one might go to purchase mineral specimens. In addition to a museum shop, one might also try purchasing from the Amazon website.
Can high pressure can change an igneous rock into a sedimentary rock?
No, high pressure alone cannot change an igneous rock into sedimentary rock; however, the reverse is true. High pressure can change sedimentary rock into igneous rock.
What igneous rock has no visible crystals as a result of rapid cooling?
Obsidian rocks are cooled very fast, and you cannot see the crystals in them.
What igneous rock is aphanitic texture?
These are igneous rocks that are too fine textured to an extent that there mineral grains or crystalline texture cannot be seen or distinguished with the necked or unaided eyes. They appear or occur as a whole single massive crystalline extrusive body of Igneous origin. Example is Obsidian.
Do you think extrusive or intrusive igneous rocks are likely to have larger crystals?
If a rock has large crystals, it is an intrusive rock. Intrusive rocks form underneath the Earth's surface. Magma cools slowly so it has time to form large crystals. An example is granite, where you can see the crystals with your naked eye. Rocks that have small crystals are extrusive rocks. Extrusive rocks are ones that form from lava (blasted out of a volcano) so they cool very quickly, not allowing large crystals to form. An example is obsidian, where you cannot visibly see the small crystals; it just looks like one black, glassy rock.
How can you identify igneous rock?
Igneous rock usually appears with a well mixed texture without fossils, bands or layers, may contain vesicles (air bubbles or holes from trapped gases) and does not react with dilute acid.Igneous rocks can:Be glassy or frothy in appearance.Be felsic, intermediate, mafic, or ultramafic in nature.Be porous or full of bubbles.Have large crystal structure like granites.Have small crystal structure like basalts.Have a combination of large and small interlocked crystals.Be more dense than other rock types.Have an interlocking crystalline structure.Appear to be peppered with black specks.Be light enough to float (pumice).
Why do igneous rocks have either have fined or coarsed grained?
The texture is mostly dependent on the amount of time the magma or lava had to crystallize into a solid rock. Volcanic rock is formed from quickly cooling lava (also called extrusive igneous rock), and will have a fine-grained texture. Plutonic rock (also called intrusive igneous rock) is formed from slow cooling magma, and will exhibit visible crystals.
What is an aphanite?
An aphanite is a specific type of dark igneous rock with grain fine enough that individual crystals cannot be seen by the naked eye.
What can a mineral not be?
A mineral cannot be made from living organisms or have a uniform chemical composition that varies significantly from one specimen to another. Additionally, a mineral cannot be a synthetic or man-made material.
What can minerals not be?
A mineral cannot be organic. A mineral cannot be made by or composed of life forms.
What mineral cannot be scratched by another mineral?
A diamond. Actually, a diamond can be scratched my other minerals.
How light reflects from a mineral's surfrace?
it can only reflect off a minerals surface if it had the luster of glassy, metallic or pearly if the mineral is whats called dull the darkness of that mineral cannot obsorb the light like the brighter minerals can
Mineral properties cannot be used to identify a mineral?
Mass
Why is oxygen teeth and honey not a mineral?
A mineral must follow a certain criteria. It has to be naturally occurring, generally inorganic homogeneous solid with a crystalline structure and a definite (but not fixed) chemical composition. Water cannot be a mineral because it is a liquid. Honey cannot be a mineral because it is a liquid and is organic Oxygen cannot be a mineral because it is a gas. Teeth cannot be a mineral they are organic. Ice, however, can be a mineral if it is formed naturally. Ice forming on your windshield is a mineral but ice from an ice cube tray is not a mineral.
