What is the name of the mineral used to make the pigment 'cobalt blue'? - Quora

Where is Tanzanite primarily found? - Quora

Is blue aragonite natural? - Quora

Can you identify the green vein mineral in serpentinite? - Quora

What kind of rare minerals or elements do smartphones, computers, and gaming consoles use? Can we have these technologies without the use of those rare earth metals or elements? - Quora

If emerald is green and ruby is red, then what is blue? - Quora

What are the good qualities of Blue Sapphire? - Quora

What is the name of the mineral used to make the pigment 'cobalt blue'? - Quora

What color is the bluest? - Quora

How are gems such as emerald, ruby, sapphire, and amethyst valued? - Quora

What is a genuine Tanzanite necklace? - Quora

What colors are common in metamorphic rocks? - Quora

What is the definition of a sapphire? Are there any non-blue varieties of sapphires that can be called 'sapphire'? If so, why aren't they called something else? - Quora