Obsidian is volcanic silicon dioxide glass that forms naturally when lava cools quickly. Because the lava cools so quickly, crystals do not have time to form. Which evidence explains why obsidian is not classified as a mineral?

a  solution  is always transparent, light passes through with no scattering from solute particles which are molecule in size. the  solution  is homogeneous and does not settle out. a colloid is intermediate between asolution  and a  suspension. while asuspension  will separate out a colloid will not.

answer; 4 electrons;