Which of the following statements is false? Formation of table salt:
Calcite and aragonite minerals that constitute clam shells are examples of which method of mineral formation?
Which of the following statements is false? Crystals:
Which of the following is not a mineral?
The tendency of a mineral to break and produce smooth, curving shell-shaped surfaces is termed:
An unknown mineral scratches glass, has only average specific gravity, and shows no cleavage but does show conchoidal fracture. Which of the following could it be?
Which of the following statements is false? Diamonds:
The expression "24 karat" must mean that:
When you scrape a mineral along a ceramic plate to observe the color of its powder, you are checking the physical property known as:
An unknown mineral sample can be scratched by a copper penny and will scratch the penny. It reacts with dilute hydrochloric acid to produce carbon dioxide gas. Which of the following could it be?
Which of the following groups of silicate minerals exhibits a single strong cleavage in one direction?
Glass is not a mineral because it doesn't have crystal lattice structure.
A geode is filled with anhedral crystals on its walls.
Calcite and halite both have one direction of cleavage.
Mica peels apart in parallel sheets because the chemical bonds between sheets are weak and the chemical bonds within sheets are strong.
The energy of various crystals has been shown to “channel the life force” and positively affect humans.
Ice crystals form by solidification of a melt.
Minerals can be destroyed by heating them, by dissolving them, by some chemical reactions, or by microbial action.
Pegmatites are rocks composed of extremely fine-grained mineral crystals so it's easy to see the gemstones in them.
Color and cleavage are two very useful physical properties used to identify quartz.
Gold and copper can both be found as native metals.
Facets are simply a jeweler's encouragement of crystal faces.
The Hope Diamond, now in the Smithsonian Institution in Washington, D.C., has exceptional value because in addition to being the subject of legends and curses, it's a rare blue diamond.
Examples of precious stones are diamonds, rubies, sapphires, and emeralds; examples of semi-precious stones are aquamarines, garnets, topaz, and tourmaline.
All precious and semi-precious stones must be transparent.