Minerology - scientific aticle PDF

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MINEROLOG Y LILY JOY BINWAG SCIENTIFIC ARTICLE

Crystallographic Systems' Elements. Isometric crystal is Also called the cubic system. This system's crystallographic axes are equal in length and Tetragonal crystal system minerals Three mutually di l perpendicular axes. The two horizontal axes are identical in length, but the vertical axis might be shorter or longer than the other two. This system's minerals have a common 4 fold symmetry axis Orthorhombic crystal system minerals Three mutually perpendicular axes, each of which has a distinct length. Triclinic Crystals Three unequal axes cross at oblique angles. No axes are perpendicular to each other. Triclinic crystals have a 1-fold symmetry a is the same as ha ing no s mmetr hexagonal crystal system minerals Three crystallographic axes overlap at 120°, with a fourth perpendicular to the other three. This fourth axis is Monoclinic system crystals Three axes are alluded to. They are shown vertically because two are slanted at an oblique angle. The third axis is perpendicular

COLORS ARE USED TO IDENTIFY MINERALS. Colors associated with opaque minerals tend to be more constant, making identification easier. Streak is the mineral's powdered hue. Streak reveals the mineral's color. Trace minerals may modify the color of a mineral by reflecting light differently. Using a streak plate to examine a mineral's streak color.

Quartz, feldspar, augite, and hornblende formation processes. Forming minerals Process Quartz is formed as lava cools. This white mineral may be found in metamorphic rock veins. After the first hour-glass skeleton is formed, the skeleton is completed by crystallizing augite richer in FeO, Na2O, TiO2, and Al2O3. Hornblende is 56 complicated, 2.9-3.4 specific gravity, and brown or black. Prior to the eruption, it crystallized. When buried deep enough, strata rich in clay transform into biotite. Muscovite is a silicate that looks black, brown, or silver when whole but becomes colorless when broken into sheets. Calcite comprises calcium carbonate, shells, coral, excrement, and algal waste. Metamorphosing shale, a sedimentary rock rich in aluminum, produces garnet.

A streak plate is a plain ceramic tile. To test a mineral, brush it over the tile to generate a scratch. Examine the residue's hue on the tile. Hardness is a suitable mineral identification property. Hardness is a mineral's scratch resistance. Two criteria characterize cleavage. The first set of criteria describes cleavage ease. Perfect cleavage is easy to acquire and identify. The cleavage surface is fractured. The crystals are lattice. Amorphous means without crystalline structure. Diaphaneity is a mineral's degree of transparency. Transparency may also be affected by mineral thickness. Experiment with the specimen's transparency. Transparent means are see-through.

Tenacity indicates how a mineral's particles cling together or resist separation....