GEO 101 Quiz 2 (ch 3)

Crystal

A continuous, uninterrupted piece of a single mineral that grows in place is called a?

Quartz

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?

Biomineralization

Calcite and aragonite minerals that constitute clam shells are examples of which method of mineral formation?

Conchoidal fracture

The tendency of a mineral to break and produce smooth, curving shell-shaped surfaces is termed?

Origin of formation

The scheme for classifying rocks is based on?

The lead in the pencil you write with.

Graphite is?

a. Observing the entire outcrop can provide important information about rock relationships and layering. b. Sand-sized and larger grains can be identified with a hand lens. c. A hand specimen is a small piece of the outcrop that can be examined closely. *d. A rock's texture cannot be characterized from a hand specimen; it can only be done in thin section.*

Identify the FALSE statement about making observations about rocks at an outcrop:

a. have the silicon-oxygen tetrahedron as their structural unit. b. are a major component of continental crust. c. are classified on the basis of how the tetrahedrons join and share oxygen atoms. *d. are a large category of minerals and include the common minerals calcite and dolomite.*

Identify the FALSE statement. Silicates:

Streak

When you scrape a mineral along a ceramic plate to observe the color of its powder, you are checking the physical property known as:

Sheet silicates

Which of the following groups of silicate minerals exhibits a single strong cleavage in one direction?

a. It is a coherent mass. *b. It has a definable chemical composition.* c. It is a naturally occurring material. d. It is a collection of minerals or a body of glass.

Which of the following is NOT a characteristic of a rock?

Oil, because it's a liquid, not a solid

Which of the following is NOT a mineral?

Oyster shell (CaCO3)

Which of the following is a mineral?

*a. Color, because quartz can be many different colors.* b. Fracture, because quartz does not have fracture. c. Hardness, because quartz is softer than most minerals in Mohs scale. d. Crystal habit, because quartz has a fibrous crystal habit.

Which of the following statements accurately describes a property that is NOT useful in identifying quartz?

a. have an orderly internal arrangement of atoms arranged in a lattice pattern. b. grow outward from a seed. *c. are formed by the high-temperature, extremely rapid process known as solid-state diffusion.* d. display symmetry.

Which of the following statements is FALSE? Crystals:

Are found in carrot-shaped structures called pegmatites

Which of the following statements is FALSE? Diamonds:

a. is, in mineralogic terms, formation of the halide mineral halite. b. takes place when a solution has become saturated. *c. is an example of solidification of a melt.* d. results in cubic crystals.

Which of the following statements is FALSE? Formation of table salt:

a. Hydrogen has an atomic mass of 1. b. An isotope of an element has the same atomic mass, but different atomic number. *c. Helium has an atomic number of 2.* d. The atomic mass of an element is approximately equal to the number of protons in an atom of that element.

Which of the following statements is TRUE?