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Amphibole is a group of inosilicate minerals characterized by their double-chain silicate structure, which gives them a complex composition often including iron, magnesium, calcium, and aluminum. They typically exhibit a prismatic crystal habit and can be found in a range of colors, including dark green, black, and brown. Amphiboles are known for their cleavage at angles of about 124 and 56 degrees, and they are commonly found in metamorphic and igneous rocks. These minerals are important in geology as they can provide information about the conditions under which rocks formed.
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What is the harness of amphibole?
The harness of amphibole, a group of silicate minerals, typically ranges from 5 to 6 on the Mohs scale. This hardness indicates that amphibole is relatively hard and can scratch glass but can be scratched by harder materials. The specific hardness can vary slightly depending on the exact type of amphibole, as there are several different species within this mineral group.
What physical property can be used to distinguish quartz from amphibole?
One physical property that can be used to distinguish quartz from amphibole is hardness. Quartz has a hardness of 7 on the Mohs scale, while amphibole minerals like hornblende have a hardness ranging from 5 to 6. Additionally, quartz typically has a glassy luster, while amphibole minerals have a dull to vitreous luster.
How would you differentiate amphibole from olivine?
Amphibole and olivine can be differentiated based on their mineral structure and composition. Amphibole is a complex silicate mineral with a double-chain structure, typically containing hydroxyl groups (OH) and exhibiting a range of colors, while olivine is a simple silicate with a single-chain structure, primarily composed of magnesium and iron silicate (Mg, Fe)2SiO4. Additionally, olivine commonly appears green and has a glassy luster, whereas amphibole can exhibit a more varied color palette and often has a more fibrous or prismatic habit. Lastly, amphibole has a lower hardness than olivine, making it easier to scratch.
How would you classify a fine grained igneous r rock that contains approximately 25 percent amphibole 15 percent biotite and 60 percent plagioclase feldspar?
The rock can be classified as a basalt if it is dark-colored and has a fine-grained texture, given its high plagioclase feldspar content and the presence of amphibole and biotite. Alternatively, if it has a lighter color, it could be classified as a diorite or andesite, depending on the specific proportions of minerals and its overall composition. The significant presence of amphibole and biotite suggests a more intermediate composition, potentially placing it in the andesite category. Overall, further details about its color and specific mineral characteristics would aid in precise classification.
What mineral is hard enough to scratch calcite but no hard enough to scratch amphibole?
Fluorite is a mineral that is hard enough to scratch calcite, which has a hardness of 3 on the Mohs scale, as fluorite has a hardness of 4. However, fluorite cannot scratch amphibole, which typically has a hardness ranging from 5 to 6. Thus, fluorite fits the criteria of being harder than calcite but softer than amphibole.
What rock contains both amphibole and potassium feldspar?
Granite is a rock containing both amphibole and potassium feldspar.
What is the hardness of Amphibole on the Mohs scale of hardness?
The individual minerals in the Amphibole group are between 5-6 on the Mohs scale.
What is the harness of amphibole?
The harness of amphibole, a group of silicate minerals, typically ranges from 5 to 6 on the Mohs scale. This hardness indicates that amphibole is relatively hard and can scratch glass but can be scratched by harder materials. The specific hardness can vary slightly depending on the exact type of amphibole, as there are several different species within this mineral group.
Amphibole chemical formula?
The Amphibole chemical formula is Mg,Fe,Ca,Na)2-3(Mg,Fe,Al)5(Si,Al)8O22OH2.
What physical property can be used to distinguish quartz from amphibole?
One physical property that can be used to distinguish quartz from amphibole is hardness. Quartz has a hardness of 7 on the Mohs scale, while amphibole minerals like hornblende have a hardness ranging from 5 to 6. Additionally, quartz typically has a glassy luster, while amphibole minerals have a dull to vitreous luster.
What is a double chain silicates?
An Amphibole (eg asbestos).
What is an arfvedsonite?
An arfvedsonite is a rare sodium amphibole mineral.
What is the mineral of andesite?
plagioclase feldspar, pyroxene, horneblende (amphibole)
Can amphibole scratch glass?
No, amphibole minerals typically have a hardness of around 5 to 6 on the Mohs scale, while glass has a hardness of about 5.5. This means that amphibole is not hard enough to scratch glass.
Which mineral is hard enough to scratch calcite but not hard enough to scratch amphibole?
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What is an amphibole?
Amphibole is a group of inosilicate minerals that are typically dark-colored and composed of double-chain silicate structures. They are commonly found in metamorphic and igneous rocks, and some types of amphibole, such as hornblende, can also be present in hydrothermal veins. Amphiboles have a variety of physical properties and are known for their long, prismatic crystal shapes.
Which silicate mineral forms a double chain silicate structure?
amphibole
