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Crystal Encyclopedia

Opal

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Opals are a unique and mesmerizing gemstone known for their distinctive play of color, making them one of the most sought-after and mysterious gemstones in the world. In this introduction, we will provide a definition and a brief overview of opals. Hydrophane opal (precious opal) dried out (Tertiary; Ethiopia) Opal from Yowah, Queensland, Australia Definition: […]

Malachite

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Malachite is a carbonate mineral with chemical composition of Cu2CO3(OH)2. Possibly the earliest ore of copper, malachite is believed to have been mined in the Sinai and eastern deserts of ancient Egypt from as early as 3000 BCE. Single crystals are uncommon; when found, they are short to long prisms. Malachite is usually found as […]

Celestobarite

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Celestobarite is a rare mineral that belongs to the barite group. It is a compound composed of strontium sulfate (SrSO4) and barium sulfate (BaSO4), hence its name, which combines “celestine” (strontium sulfate) and “barite” (barium sulfate). The mineral typically forms in hydrothermal veins alongside other minerals such as gypsum, anhydrite, and various sulfides. It often […]

Amygdaloidal Agate

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Amygdaloidal agate is a specific type of agate that forms within the voids or cavities of volcanic rocks. These voids, often created by gas bubbles in the lava, are called “amygdales” or “vesicles.” When these cavities are filled with mineral-rich hydrothermal fluids, the minerals precipitate out to form agate—a colorful, banded form of silica. Amygdaloidal […]

Liddicoatite

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Liddicoatite is a fascinating mineral that belongs to the extensive tourmaline group. This gemstone is chemically classified as a calcium-rich lithium aluminum borosilicate. The characteristic that distinguishes liddicoatite from other tourmalines is its unique trigonal crystal system and its complex, multi-colored zoning patterns, often visible in cross-sections of the crystals. These zones appear as concentric […]

Pink Rhodochrosite

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Pink rhodochrosite is a beautiful gemstone known for its delicate pink hue and unique patterns. It is a manganese carbonate mineral with the chemical formula MnCO3. Rhodochrosite belongs to the carbonate mineral family, which includes other well-known minerals such as calcite and dolomite. One of the distinguishing features of pink rhodochrosite is its color, which […]

Fire Quartz

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Fire quartz is a captivating variety of quartz distinguished by its fiery appearance, often due to inclusions of hematite or goethite. These inclusions create a mesmerizing play of light, resembling flickering flames within the quartz crystal. Also known as hematoid quartz or ferruginous quartz, fire quartz combines the properties of quartz with the grounding and […]