Obsidian is mineral-like, but not a true mineral because as a glass it is not crystalline; in addition, its composition is too complex to comprise a single mineral. It is sometimes classified as a mineraloid. Crystalline rocks with obsidian's composition include granite and rhyolite.
What is obsidian classified as a mineral?
Obsidian is a volcanic glass that forms when lava cools very quickly and consists of a solid mass of glass through and through. Why is obsidian not classified as a mineral?
What would be the significance of finding a precipitated mineral on another planet?
What would be the significance of finding a precipitated mineral on another planet? The planet may have or have had liquid water on it. the following steps describing how a clastic sedimentary rock forms from its pre-existing parent rock. Lahars are a volcanic hazard that can occur both during an eruption and while a volcano is dormant.
Why is color not an indicator of mineral identity?
2. When exposed to air and water, the color may be altered. 3. Small of amounts of contaminants can affect color. Why is color not a good indicator of mineral identity? A mineral is radioactive if it contains unstable nuclei that decay (break apart) into stable nuclei over time. What makes a mineral radioactive?
How do you identify minerals in science?
Identify the following substances as mineral, mineral simulant, or non-mineral. Some minerals can be identified based on their distinctive crystal shape. Label the minerals with the correct name. Obsidian is a volcanic glass that forms when lava cools very quickly and consists of a solid mass of glass through and through.
Why is obsidian not classified as a mineral?
Obsidian is mineral-like, but not a true mineral because, as a glass, it is not crystalline; in addition, its composition is too variable to be classified as a mineral.
Why is obsidian not classified as a mineral quizlet?
Obsidian is a volcanic glass that forms when lava cools very quickly and consists of a solid mass of glass through and through. Why is obsidian not classified as a mineral? The atoms or molecules in obsidian do not have a crystalline structure.
Why is the volcanic glass obsidian not a mineral quizlet?
Note: Some naturally occurring solids lack a repetitive structure and are not considered minerals e.g. obsidian (volcanic glass). More than 4000 minerals have been named, though no more than a dozen make most of the rocks of Earth's curst known as rock-forming minerals.
Which material is not a mineral?
Glasses such as obsidian, which are disordered solids, liquids (e.g., water, mercury), and gases (e.g., air) do not have a crystalline structure and are therefore not minerals.
Which of the following is a mineral obsidian?
obsidian, igneous rock occurring as a natural glass formed by the rapid cooling of viscous lava from volcanoes. Obsidian is extremely rich in silica (about 65 to 80 percent), is low in water, and has a chemical composition similar to rhyolite.
Why is glass not a mineral?
Note also that the "minerals" as used in the nutritional sense are not minerals as defined geologically. Glass - can be naturally formed (volcanic glass called obsidian), is a solid, its chemical composition, however, is not always the same, and it does not have a crystalline structure. Thus, glass is not a mineral.
What is obsidian quizlet?
obsidian. a volcanic glass similar in composition to granite, usually dark but transparent in thin pieces, and having a good conchoidal fracture. spears. to stick something sharp through an object.
Is obsidian metallic or nonmetallic?
Rarely, obsidian has an iridescent or metallic "sheen" caused by light reflecting from minute inclusions of mineral crystals, rock debris, or gas. These colored specimens are known as "rainbow obsidian," "golden obsidian," or "silver obsidian," depending upon the color of the sheen or iridescence.
How does obsidian form quizlet?
Obsidian forms above ground from lava that is similar in composition to the magma from which granite forms underground, but cools so quickly that minerals do not have a chance to form within it. Tiny bits of lava and ash that get shot out of a volcano can become stuck together.
Which is not a mineral quizlet?
A mineral has to be naturally occurring, inorganic, solid, have a crystal structure, and have a definite chemical composition. Coal is not a mineral because it is carbon-based and came from fossilized plants.
Which one of the following is not a mineral plate?
The correct answer is Antarctica.
What makes a mineral a mineral?
A mineral is a naturally occurring inorganic element or compound having an orderly internal structure and characteristic chemical composition, crystal form, and physical properties. Common minerals include quartz, feldspar, mica, amphibole, olivine, and calcite.
Why do crystals of the same minerals always have the same structure?
Crystals of the same minerals always have the same structure because the molecules of the mineral are always arranged in the same repeating pattern.
When a mineral reflects light in such a way that is like a cat eye, what is the answer?
Chatoyancy : When a mineral reflects light in such a way that is looks like a cat eye.
What is the Mohs scale?
Mohs hardness scale ; scale ranking 10 minerals from softest to hardest; used in describing the hardness of minerals compared to others; be able to use the chart to determine if one mineral can be scratched by another
What is radioactive mineral?
A mineral is radioactive if it contains unstable nuclei that decay (break apart) into stable nuclei over time.
What determines the physical properties of a substance?
The arrangement of the atoms or molecules determine the physical properties.
Does chemical weathering change the color of a mineral?
Chemical Weathering may change the surface appearance of a mineral. Small amounts of impurities can change the color of a mineral.
Is obsidian a repeating crystalline structure?
The atoms in obsidian are not arranged in a regularly repeating crystalline structure.
Why does graphite have cleavage?
Graphite has cleavage because the weak bonds between the layers break easily.
Is halite a cubic mineral?
the crystals of each mineral are unique. All halite crystals are cubic.
Which minerals begin to crystallize?
Magnesium- and iron-rich minerals begin to crystallize.;
Does a sandstone have a crystal structure?
it does not have a crystal structure.
Does obsidian have a crystalline structure?
The atoms or molecules in obsidian do not have a crystalline structure.
Can a rock incorporate chemicals?
they can incorporate chemicals from the surrounding rock.
Is magma less dense than rock?
The magma is less dense than the surrounding rock.
What are the elements that make up silicates?
Silicates - quartz and talc; nonsilicates - pyrite or gypsum; native element - gold or diamond
How do sandstones form?
They can form from the evaporation of seawater.
Why do minerals grow bigger?
Because minerals form from cooling magma have a longer time to cool; therefore, they can grow larger.
What is igneous rock?
Igneous - Igneous rock is formed from the melting and cooling of rock and minerals. Ex.: obsidian, granite, basalt
How many special properties are there in minerals?
List the special properties of minerals and tell one mineral for each special property. There are 5
What is sedimentary rock?
Sedimentary - formed through weathering, erosion, deposition, compaction, and cementation of rock, minerals, and organic material.
What is a naturally formed solid?
Naturally formed, inorganic solid with a definite chemical composition and an orderly arrangement to its atoms (crystalline structure)
