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Q: What are hard round rock structures that form when mineral crystallize around mineral fragments?
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How do minerals form around chimneys on the ocean floor?

menerals crystallize in the cold sea.


How far can fragments travel from a 1-pounnd explosion?

It depends upon the size of the fragments. Very small fragments can be blown into the air and carried by air currents around the world.


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Tiny fragments can travel all the way around the earth from a 1-pound explosion.


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Dust, rock fragments and ice.


What are cinder cones are made of?

Cinder Cones are composed of rock fragments and the eruption of cinders. The rock fragments pile up around a single crater forming a Cinder Cone.


What is a hydrothermal mineral?

It is a mineral which has crystallized from material supplied by hot fluid mixtures which circulate in and around rock.


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"Around the corner" is a prepositional phrase.


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What hardness does a mineral have if it does not scratch glass but scratches an iron nail?

The hardness of glass is around 6, and the hardness of iron is about 5. So your mineral is probably around a 5.5.


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What is the mineral hardness of marble?

Marble isn't a mineral, but it is made out of around 100% calcite, which is typically 2.5 - 3 on Moh's hardness scale.