Differentiation

Of Rocks and Minerals

(GS -122 Laboratory) Members:

Acedera, SherlyEntera, EliztharParamo, ClarineSarmiento, AljunSolas, Mary Elizabeth

Physical Properties of QuartzChemical Classification silicateColor Quartz occurs in virtually every color. Common colors are clear,

white, gray, purple, yellow, brown, black, pink, green, red.Streak colorless (harder than the streak plate)Luster vitreousDiaphaneity transparent to translucentCleavage none - typically breaks with a conchoidal fractureMohs Hardness 7Specific Gravity 2.6 to 2.7Diagnostic Properties conchoidal fracture, glassy luster, hardnessChemical Composition SiO2

Crystal System hexagonal

QUARTZ

Ordinary yet extraordinary, colorful and clear, Quartz crystals are the most common and abundant in the world, comprising the largest and most diverse family in the mineral kingdom. "From ancient times to the present day, quartz crystals have been a source of Light to mankind. Highly valued by spiritual leaders and healers as well as scientists, the unique attributes of quartz have played a key role in mankind' evolutionary development.

BORNITE

Bornite is a copper iron sulfide mineral commonly found in hydrothermal veins, contact metamorphic rocks and in the enriched zone of sulfide copper deposits. It is a common ore of copper and is easily recognized because it tarnishes to iridescent shades of blue, purple, green and yellow. It is often mined as an ore of copper. 

Physical Properties of BorniteChemical Classification sulfideColor brownish bronze on a fresh surface,

iridescent purple, blue, and black on a tarnished surface

Streak grayish blackLuster metallicDiaphaneity opaqueCleavage poorMohs Hardness 3Specific Gravity 5.0 to 5.1Diagnostic Properties colorChemical Composition copper iron sulfide, Cu5FeS4

Crystal System tetragonalUses Primarily an ore of copper.

Physical Properties of PyriteChemical Classification sulfideColor brass yellow - often tarnished to dull brassStreak greenish black to brownish blackLuster metallicDiaphaneity opaqueCleavage breaks with a conchoidal fractureMohs Hardness 6 to 6.5Specific Gravity 4.9 to 5.2Diagnostic Properties color, hardness, brittle, greenish black streakChemical Composition iron sulfide, FeS2

Crystal System isometric

Physical Properties of Oxidized Pyrite

Color : pink

Other properties : the same as pyrite

OXIDIZED PYRITE

Physical Properties of MILKY QUARTZVARIETY OF: Quartz , SiO2 , Silicon Dioxide.USES: Ornamental stone.COLOR: various shades of white, usually milky.INDEX OF REFRACTION: 1.544-1.553BIREFRINGENCE: 0.009HARDNESS: 7CLEAVAGE: noneCRYSTAL SYSTEM: trigonal

MILKY QUARTZ

Milky quartz is one of the most common varieties of crystalline quartz, created when tiny amounts of gas or liquid are trapped inside during crystal formation, giving it a cloudy white color. While the quartz's cloudiness prohibits optical and electronic applications, the trapped fluids give the stone an attractive luster, making it ideal for decorative