The minerals listed below play important roles in everyday life. Some are source
ID: 111922 • Letter: T
Question
The minerals listed below play important roles in everyday life. Some are sources of metals and others are used because of their physical properties. Match the mineral with its use and explain what makes it ideal for that purpose. Some minerals may be used for more than one purpose. You may want to check the chemical formulas of these minerals in the textbook and online for clues.
Hematite, Garnet, Halite, Galena, Quartz, Magnetite, Graphite, Calcite, Gypsum
Economic uses
Mineral
Why ideal for this use?
Melt ice on roads
Very hard abrasive
Make wallboard (Sheetrock)
Major component of glass
Decrease acidity of fields and gardens
Source of lead
Source of iron
Lubricant for locks
writing material used in pencils
Navigation with a compass
Economic uses
Mineral
Why ideal for this use?
Melt ice on roads
Very hard abrasive
Make wallboard (Sheetrock)
Major component of glass
Decrease acidity of fields and gardens
Source of lead
Source of iron
Lubricant for locks
writing material used in pencils
Navigation with a compass
Explanation / Answer
Melts ice on road- Halite – Halite is common salt; which will reduce melting point of water, thus melts ice away.
Very hard abrasive- Garnet- Garnet is a high grade metamorphic rock with hardness ranges from 6.5- 7.5, and resistant to temperature, hence it is ideal for abrasive
Make wallboard- Gypsum- Gypsum is soft , composed of calcium sulfate dehydrate, with the chemical formula CaSO. 2H2O. Gypsum building plasters are used extensively for general building operations which have advantages like lightness and high fire resistance.
Major component of glass – quartz- Because of high purity silica (SiO2) in them.
Decrease acidity of fields and gardens- calcite- CaCO3 is a base, thus it will neutralize acid and produce water plus salt as byproducts.
Source of lead- galena- Lead sulphate is the major lead ore used.
Source of iron- Hematite and magnetite - Two main types of iron ore used for iron making – Magnetite (Fe3O4) and Hematite (Fe2O3). Common iron ores include: Hematite - Fe2O3 - 70 percent iron. Magnetite - Fe3O4 - 72 percent iron
Lubricant for locks- graphite- Graphite contains layers of carbon atoms. The layers slide over each other easily because there are only weak forces between them, making graphite slippery.
writing material used in pencils- Graphite- graphite gives the B characteristics to a pencil which can be described as the blackness and softness along with its layered structure.
Navigation with a compass- Magnetite- because it has magnetic properties
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