erties of matter mineral properties hardness (scratch test) color luster special properties feldspar 6…
erties of matter mineral properties hardness (scratch test) color luster special properties feldspar 6 scratches glass pink or white dull/pearly - gypsum 2 scratched by fingernail white/gray dull - mica 2 scratched by fingernail black/gray shiny splits into thin sheets talc 1 easily scratched by fingernail white dull - calcite 3 scratched by nail white dull/glassy bubbles with acid mike is holding a dull rock in his hand. he cant scratch it with his fingernail or with a nail. the rock is a light pinkish - white color. which kind of mineral from the table is the rock most likely made of? a. feldspar b. gypsum c. talc 1 of 5 answered session score: 100% (1/1)
Answer
Explanation:
Step1: Analyze hardness condition
The rock can't be scratched by fingernail or nail. Gypsum (hardness 2, scratched by fingernail), Mica (hardness 2, scratched by fingernail) and Talc (hardness 1, easily scratched by fingernail) are excluded as they can be scratched by fingernail.
Step2: Analyze color and luster
Feldspar has a pink - or white color and dull/pearly luster, and its hardness is 6 (scratches glass), which meets the conditions of the rock in hand. Calcite is white but has a special property of bubbling with acid which is not mentioned for the rock in hand.
Answer:
A. feldspar