What mineral is this? Egg-sized piece. Transparent pink color with glassy luster. Shows conchoidal fracture. The hardness is 7.
2 answers:
Answer: Pink Quartz
Explanation:
Quartz. Can come on different colours like pink, white, gray, purple, black, yellow or green.
<u>Luster</u> means Appearance, Quartz unlike Silica, looks like glass.
<u>Conchoidal fracture: </u>It´s how Quartz´s surface fractures on a smoothly curved way.
Hardness is mineral´s property of being scratched by others. Mohs scale of mineral hardness is used to classify a mineral as softer or not. In this case, quartz has a hardness of 7, that means it´s quite hard, since the scale starts in 1 and finishes in 10.
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Answer:
A. Coal
Explanation:
= water displaced by rock
Water displaced by rock = volume of water after rock is dropped into the cylinder - volume of water before the rock was dropped into the water
Water displaced by the rock = 180 ml - 150 ml = 30 ml
Density of rock:
40 grams => 30 ml
x grams => 1 ml
Cross multiply
1*40 = 30*x
40 = 30x
40/30 = 30x/30
1.3 = x
Density of rock = 1.3 g per 1 ml
Recall: 1 ml = 1 cm³
Therefore,
Density of the rock = 1.3 g/cm³
1.3 g/cm³ falls within the range of 1.1 - 1.4 g/cm³
Therefore, the rock is identified as Coal.