Pyrite has a color streak of a greenish or blackish color, it has a metallic luster, it also has an uneven fracture habit, but it belongs in the cubic crystal system, the specific gravity is about 4.9 - 5.2
Granite has a color of black, white, and grey, its grain size and texture is coarse and granular, it is an extrusive, mafic and basic rock
Sandstone has a color of red-brown, its grain size and texture is fine-grained and porous, it is a sedimentary, clastic type of rock.
Marble has a color of a pale grey, its grain size and texture is coarsely crystalline, sugary, and glassy, its is a high grade metamorphosed.
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Johnathan Panagos
11/22/2013 02:38:02 am
Hematite is a mineral that is very resistant to weathering. This mineral is found in acid igneous and sedimentary rocks. The color of the mineral is a red-brown color. The color of its streak is also a red-brown color. Hematite has a metallic luster. Its cleavage is uneven which means it has an uneven fracture habit. The mineral belongs to a massive or granular crystal system. Also, the hardness is like a knife which means it has a specific gravity of 5.
Obsidian is an Igneous rock that is very hard. It is used for building materials and monuments. The color of this mineral is black. This rock has no grains visible on it. Obsidian is a extrusive and felsic type of rock.
Sandstone is a sedimentary rock that accumulates through wind or water processes. Sandstone’s color is red-brown. Its grain size and texture is fined grained and porous. Sandstone is a clastic type of rock.
Marble is a metamorphic rock that is in a low grade metamorphism. Its color is a pale grey. Its grain size and texture is coarsely crystalline, sugary and glassy. Marble is a high grade metamorphosed type of rock.
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Jose Garcia
11/22/2013 03:07:15 am
Pyrite the color of this mineral would be brass-yellow, the luster is metallic, the cleavage and fracture are none, the crystal system is cubic, and hardness and specific gravity is 6.
Sandstone is a sedimentary rock that accumulates through wind ir water process, its color is red-brown, its grain size and texture is fined grained and porous, and its a clastic type of rock.
Obsadian is an igneous rock that is very hard. Its used for building materials and monuments, the color is black, the rock has no grained or porous, and is a extrusive and felsic type of rock.
Marble is a metamorphic rock that is low grade metamorphism, its color is pale grey, its grain size and texture is coarsely crystalline, sugar and glassy, its a high grade metamorphosed type of rock.
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Mara Lopez
11/22/2013 03:10:40 am
Quartz is a mineral that is very resistant to weathering. It is found in acid igneous rocks and sedimentary rocks. The color of Quartz is colorless and the streak is white.It has a vitreous luster. Quartz belongs to the hexagonal crystal structure. The specific gravity of Quartz is 6.25 and the hardness of it is a 7.
Obsidian is an igneous rock also known as volcanic glass.Crystals do not grow in this rock so that is why it has a glass texture. The color of Obsidian is black. There are no grains visible on this rock. Obsidian is an extrusive and felsic rock.
Sandstone is a sedimentary rock.The color of Sandstone is a reddish brown color. Sandstone is a fine-grained and porous rock. Sandstone is also a clastic sedimentary rock.
Slate is a low grade metamorphic rock. The color of slate is grey. Slate is fine- grained. Slate is also a low grade metamorphosed. Slate can be used for roofing or paving.
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Lyney Serrato
11/22/2013 03:15:46 am
Biotite is a mineral that can be easily identified by its black or dark brown color, and its interesting flaky cleavage. Also, it has a vitreous luster, uneven fracture habit that is one, perfect, and has a gravity of 2.8-3.2. Obsidian or a volcanic glass is a igneous rock that is formed from the rapid of cooling of lava. With Obsidian the crystals do not grow and it gives the rock its glassy-like texture. A type of sedimentary rock would be Limestone. Limestone has a yellow-white color, and with a coarse-grained texture. A metamorphic rock would be Marble. Marble is a high grade metamorphic rock that's include in buildings, monuments, and sculptures. It has a pale grey color, and its coarsely crystalline, sugary and glassy texture.
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Jessica Rosario
11/22/2013 03:18:36 am
Hematite consists of red streaks. Its properties include an earthy luster and uneven fracture. Has a hardness of 5 to 6 on the Mohs scale. It has a red and brown color.
Granite has a black white and grey color.It is a course-grained igneous rock. The texture is course and granular.The type of rock is intrusive, felsic and acidic.
Sandstone has a red-brown color. The grain size and texture is fine-grained and porous. The rock type is sedimentary and clastic.
Gneiss has white,black, and grey color. Its grain size and texture is a coarse-grained and foliated. Gneiss has a high-grained and metamorphic rock type.
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Tania Nava
11/22/2013 03:18:54 am
Quartz: This mineral has a conchoidal fracture habit, it belongs to the hexagonal crystal system, its gravity is 2.65
Obsidian : the rock is black, it has no visible grains, it is an extrusive and felsic type of rock.
Sandstone: is red brown, it is fine grained and porous, it is a sedimentary, clastic type of rock.
Marble : it is pale grey , its texture is coarsely crystalline , sugary and glassy, it is a high grade metamorphosed type of rock
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Jennifer Bonilla
11/23/2013 10:48:46 am
Pyrite is a type of mineral with a greenish-black streak. It is known to have a cubic crystal structure. Its luster can be described as metallic. Because it is largely comprised of iron, it has a specific gravity of 4.9-5.2.
Granite is a type of igneous rock. It has black, white, and grey colors. Its texture is coarse and granular. Its rock type is Intrusive, felsic and acidic.
Sandstone is a type of sedimentary rock that has a reddish-brown color. Its texture is fine-grained and porous. Its rock type is sedimentary, clastic.
Slate is a type of metamorphic rock. It usually has a grey color to it. Its texture is fine-grained. Its rock type is known to be low grade metamorphosed.
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Eveny Salinas
11/25/2013 02:59:08 am
Marble: It's a pale grey color. It's texture is, coarsley crystaline, sugary, and glass. It is a high grade metamorphosed type of a rock.
Quartz: It is resisting to weathering. It's found in acid, igneous rocks, and sedimentary. It;s color is colorless, and it has a white streak. It has vitreous luster, and it belongs to the hexogonal crystal structure. The specific gravity is 6.5 and its hardness is a 7.
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Elizabeth Cendejas
11/25/2013 10:06:03 am
1. Hematite consists of red streaks. Its properties include an earthly luster and uneven fracture. It has a hardness of 5 to 6 on the Mohs scale. Hematite has a red and brow color.
2. Granite has a white, black, and grey color. Its size is of a grain. Its texture is coarse and granular. Granite is an extrusive, mafic and basic rock.
3. Sandstone is a sedimentary rock and it is a clastic type of rock. Its has a red-brown color. The rock's size and texture is fine-grained and porous.
4. Slate is a metamorphic rock. Slate is fine-grained and its color is grey Since slate is a low grade metamorphosed it can be used for roofing or paving.
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Cynthia Pineda (P.3)
11/25/2013 11:41:27 am
•Pyrite also known as Fool's Gold is found in igneous rocks and in ore veins. It is also iron sulfide and has a metallic luster. This mineral does not demonstrate cleavage. The Pyrite belongs to the cubic crystal system and its hardness is 6.
• Obsidian is a black igneous rock. Because of its hardness, it is used for building monuments and materials.This rock has no grains that are visible and its extrusive and felsic.
• The Limestone is a clastic sedimentary rock. The color of it is yellow-white and it is coarse-grained. This rock gathers as ocean reefs and/or skeletal remains.
• Marble is a state-of-the-art metamorphic rock and is used to build monuments, buildings, and sculptures. It is coarsely crystalline, sugary and glassy and its color is pale grey.
