Skip to main content

Orthoclase

Origin Of Name
From Greek word orthos (right angle) and klasis (to break)

    Orthoclase-Serra-de-Peneda-Portugal
    Copyright: Emil Javorsky/Encyclopedia              Britannica, Inc.

Orthoclase is common in many kinds of silicic igneous rocks, sediments such as arkoses, and a variety of metamorphic rocks. Quartz and micas are typically associated minerals

Physical Properties
. Hardness- 6
. Specific Gravity- 2.56
. Clevage- 90° clevage angle, perfect (001), good (010), poor {110}
. Fracture- Uneven
. Luster- Pearly, Vitreous
. Transparency- Translucent
. Colour- White, pink, turbid
. Streak- White

Crystal System- Monoclinc
Uses- Ceramics, glass, abrasives, gemstones

Comments

Post a Comment

Popular posts from this blog

HOW TO MAKE A GEOLOGICAL REPORT?

What is a GEOLOGICAL REPORT? Geological reports are concise, informative and well documented reports used to present, analyse and summarise field data for both industry and research purposes. They should be accompanied by geological maps, figures, stratigraphic columns, tables, graphs etc. PREPARATION First plan the layout, section by section; then draft each section using all your notes, maps, laboratory results and references gathered from other sources. Then list the illustrations needed to support the text. Finally, lay sections out in your choosen order, before gathering them together to edit  them. Does not spare the paper, allow plenty of room between the lines and at the margins for corrections, alterations and additions. REVISION AND EDITING First, a rough draft gets the essential facts and information in order. The next stage is to revise it and re-edit. The order of some paragraphs may need changing, spelling mistakes corrected, grammar improved. Indicate where illustratio
Post a Comment
Read more

Stishovite

Origin Of Name Named after S.M. Stishov, an early investigator of high-pressure Silicon dioxide polymorphs     Copyright: Geology.today Stishovite, a rare, high-pressure polymorphs of Silicon dioxide, is known only from meteor impact craters Physical Properties . Hardness- 7 to 8 . Specific Gravity- 4.30 . Clevage- (110) . Fracture- Conchoidal . Luster- Vitreous . Transparency- Transparent to translucent . Colour- Colourless . Streak- White Crystal System- Tetragonal
Post a Comment
Read more

The 10 Most Toxic Minerals

1. Cinnabar- Cinnabar is the main ore of mercury, the most toxic mineral on Earth. The name itself means dragons bloods. Form near volcanoes and sulphur deposits, the bright red colour signals danger.                    Copyright: Courtesy of Ted Boente; John H. Gerard/Encyclopedia Brittanica, Inc.  2. Orpiment- Originate from Latin auri , " golden "; pigmentum , " paint ". Composed of Arsenic Sulfide, the lethal and chemically reactive orpiment crystals are found growing below the surface in mineral formations, often near hydrothermal veins. It may crumble into dangerous powder when exposed to light. Holding crystals in your hands may release carcinogenic , neurotoxic powder.   Copyright:   U.S. Geological Survey 3. Stibnite- Antimony Sulphide, the principle ore of antimony. It is used in manufacturing of  matches and fireworks. Mines near Oksaku, Japan produce the best stibnite crystals in the world.                                                               
Post a Comment
Read more