Part A Luster refers to the way that an object, such as a mineral, reflects light. The luster may be metallic or nonmetallic. A
mineral with a metallic luster may look golden or silver. A mineral with a nonmetallic luster may look adamantine
(transparent and sparkly like a diamond), pearly, vitreous (glassy), waxy, silky, resinous (like honey), or greasy. Nonmetallic
minerals with little or no luster tend to have an earthy, dull look.
Examine all the mineral samples in your kit one by one to determine if they have a metallic or a nonmetallic luster. Some
minerals may be only partially lustrous. Hold them up to the light and look on all sides for an accurate observation.
Classify each mineral as metallic or nonmetallic in the table.
В I o x x,
Font Sizes
A-A-PEEE 3
Metallic Luster
Nonmetallic Luster

Which statements best describe the differences or similarities between a comparative investigation and an experimental investigation? check all that apply. experimental investigations are best for showing cause-and-effect relationships, while comparative investigations do not necessarily show this type of relationship. comparative investigations are often impractical and unrealistic, while experimental investigations are the most practical and realistic kinds of investigations. comparative investigations allow for the use of a wide range of variables but do not have a control group, while experimental investigations involve variables that can be controlled. both experimental investigations and comparative investigations are designed to answer scientific questions. both experimental investigations and comparative investigations focus on making observations rather than collecting new data.