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Is plagioclase a mineral?
Yes, plagioclase is a group of minerals within the feldspar family. It is a common mineral found in igneous rocks such as granite and basalt.
Why is color often an unreliable property in identifying minerals?
Color can vary within the same mineral due to impurities or environmental factors. Additionally, many minerals come in a variety of colors, making it difficult to identify them based on color alone. Therefore, color is often not a definitive property for identifying minerals.
What special kind of solid do all minerals form?
Minerals form a special kind of solid called a crystalline solid. This means that the atoms within the mineral are arranged in a specific, repeating pattern that gives the mineral its unique structure and properties.
What type of rock has crystals embedded within it?
Igneous rocks, such as granite and basalt, often have crystals embedded within them.
Which kinds of rocks and minerals are found in the great pyramid?
The primary building material of the Great Pyramid of Giza is limestone blocks, quarried locally in Egypt. Granite was used for some interior chambers and parts of the structure. Other minerals and rocks such as basalt and gypsum can also be found in smaller quantities within the pyramid.
Is plagioclase a mineral?
Yes, plagioclase is a group of minerals within the feldspar family. It is a common mineral found in igneous rocks such as granite and basalt.
What does heat and pressure do basalt change to?
Heat and pressure can transform basalt into metamorphic rocks, primarily into types such as amphibolite or greenschist, depending on the specific conditions. The intense heat can cause the minerals within basalt to recrystallize, while pressure can lead to foliation and other structural changes. This process alters the original basalt's texture and mineral composition, resulting in a new metamorphic rock.
Minerals that are heavy durable and chemically resistant are likely to be found in?
placer deposits
Why is color often an unreliable property in identifying minerals?
Color can vary within the same mineral due to impurities or environmental factors. Additionally, many minerals come in a variety of colors, making it difficult to identify them based on color alone. Therefore, color is often not a definitive property for identifying minerals.
What property is the least useful for identifying minerals?
Color is the least useful property for identifying minerals because it can vary within the same mineral species, making it less reliable for accurate identification. Other properties like hardness, cleavage, and luster are more consistent and helpful in distinguishing between different minerals.
What kind of igneous rock is mafic and formed deep in the ground?
A mafic igneous rock formed deep within the Earth's crust is typically basalt. Basalt is fine-grained and rich in minerals like pyroxene, olivine, and plagioclase. It commonly forms from the solidification of magma that has originated from the mantle.
What special kind of solid do all minerals form?
Minerals form a special kind of solid called a crystalline solid. This means that the atoms within the mineral are arranged in a specific, repeating pattern that gives the mineral its unique structure and properties.
What type of rock has crystals embedded within it?
Igneous rocks, such as granite and basalt, often have crystals embedded within them.
How can a basalt flow cause opal to form?
If the basalt flow contains air bubbles and pockets and there is a spring that contains silica then the silica can deposit into the air bubbles (the air bubbles are known as Amygdaloidal basalt or vesicles) If the silica deposits slowly and the conditions are correct then precious opal can form. Two examples of this would be in California at the Nowak and the Barnett mines.
What property is generally the least useful in identifying minerals color hardness cleavage streak?
Color is generally the least useful property for identifying minerals because it can vary widely even within the same mineral due to impurities or environmental factors. Many minerals can appear in multiple colors, making it an unreliable identifier. In contrast, properties like hardness, cleavage, and streak provide more consistent and measurable characteristics for accurate identification.
What characteristics are chatoyancy and asterism associated with?
Chatoyancy is associated with the optical property of certain minerals or gems displaying a cat-eye effect when light is reflected off them, usually due to fibrous or needle-like inclusions within the stone. Asterism is associated with the optical property of certain minerals or gems displaying a star-like pattern when light is reflected off them, usually due to inclusions arranged in a specific alignment within the stone.
Splitting into pieces with smooth regular surfaces that reflect light?
This process is called cleavage and is a property of minerals. Minerals with cleavage break along planes of weakness into smooth, flat surfaces that reflect light. Cleavage is a result of the arrangement of atoms within the mineral, and the number and orientation of cleavage planes can vary between different minerals.
