ThoughtCo: Lifelong Learning
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ThoughtCo is a premier reference site with a 20+ year focus on expert-created education content.

ThoughtCo: The 12 Most Common Blue, Violet, and Purple Minerals
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Take a closer look at the 12 most common purple, blue, and violet minerals on Earth.

ThoughtCo: 9 Common Green Rocks and Minerals
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Identification Is Easier When You Know What to Look For

ThoughtCo: How to Identify 10 Red and Pink Minerals
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This list includes, primarily, minerals that form crystals, or at least solid grains for which red or pink is the default color.

ThoughtCo: Definition and Examples of Mineral Habits
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Habits are the distinctive form that mineral crystals may take in different geologic settings.

ThoughtCo: Examples of Different Mineral Lusters
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This gallery shows the major types of luster, which range from metallic to dull.

ThoughtCo: How to Use Mineral Streak to Identify Rock Samples
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While most minerals have a white streak, a few well-known minerals can be identified by the color of their streak.

ThoughtCo: The Basics of Geology
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Let’s look at the basic elements that make up the science of geology.