occurs as perfect octahedra that are black in color with a slight bluish iridescence and metallic luster. The color of its streak is black. It can be identified primarily by its shape and by its high magnetism, which will move the needle of a compass or attract iron filings.

Generally, a rock that is black is made up of crystals that are rich in Iron and Magnesium. This is NOT the case with this rock (____________), which is instead rich in Silicon and Aluminum.  Its pitch-black, shiny appearance is due to the ABSENCE of crystals - it is pure GLASS. It forms from magma that is so gooey that elements cannot "move around" through it to arrange themselves into crystals.Group of answer choicesobsidiangranitebasaltpumice

It is a type of charcoal that is made up of lose charcoal pressed into stick. It creates a much of lose charcoal pressed into stick. It creates a much darker black.*1 pointVine CharcoalPencilSoft Compressed CharcoalCompressed Charcoal

A shiny brown coloured element ‘X’ on heating in air becomes black in colour.Name the element ‘X’ and the black coloured compound formed.

What is streak?The color of the mineral How hard the mineral is How the mineral reflects light The powdered form of the mineral

A shiny brown coloured element 'X' on heating in air becomes blackin colour. Name the element and the black coloured compoundformed