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Silo: Oxides

Ballas – The Fibrous Black Sapphire

Ballas – The Fibrous Black Sapphire

April 10, 2026 | Gemstone Encyclopedia | Joaquimma Anna

Ballas is a natural, fibrous form of corundum most often found in deep black or dark gray, prized for its unique texture and use in high‑contrast jewelry. Readers care because its striking appearance, durability, and distinctive origin set it apart from typical sapphires and rubies.

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Samarskite – Properties, Meaning, Care, and Buying Guide

Samarskite – Properties, Meaning, Care, and Buying Guide

April 9, 2026 | Gemstone Encyclopedia | Joaquimma Anna

Samarskite is a rare, opaque black oxide mineral prized by collectors for its high density and occasional use in jewelry. It offers unique visual appeal and traditional metaphysical meanings, making it a stone of interest for both gem enthusiasts and spiritual seekers.

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Cassiterite Gemstone: Properties, Meaning, Care & Buying Guide

Cassiterite Gemstone: Properties, Meaning, Care & Buying Guide

April 1, 2026 | Gemstone Encyclopedia | Joaquimma Anna

Cassiterite is a tin oxide gemstone known for its deep black or brown color and high brilliance. It is valued for jewelry use and traditional symbolism of grounding and protection, making it a subject of interest for collectors and crystal enthusiasts alike.

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Rutile – Mineral Profile, Meaning, and Jewelry Use

Rutile – Mineral Profile, Meaning, and Jewelry Use

March 24, 2026 | Gemstone Encyclopedia | Joaquimma Anna

Rutile is a titanium oxide mineral prized for its golden to reddish-brown hues and striking needle-like inclusions. It is used in faceted gems and rutilated quartz jewelry, and its unique optical properties make it a favorite among collectors and crystal enthusiasts.

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Goethite – Mineral Gemstone Profile, Meaning, Properties & Care

Goethite – Mineral Gemstone Profile, Meaning, Properties & Care

March 19, 2026 | Gemstone Encyclopedia | Joaquimma Anna

Goethite is an iron‑oxyhydroxide mineral celebrated for its warm brown‑gold to black shades, often used in artisanal jewelry and ornamental pieces. Its metallic luster and earthy tones make it a unique alternative gemstone, and collectors value it for its mineralogical significance.

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Taaffeite – Rare Violet Gemstone: Properties, Meaning, and Buying Guide

Taaffeite – Rare Violet Gemstone: Properties, Meaning, and Buying Guide

March 18, 2026 | Gemstone Encyclopedia | Joaquimma Anna

Taaffeite is a rare, naturally occurring gemstone prized for its violet to pink hues and exceptional hardness. It is sought after by collectors and jewelers alike for its rarity, dazzling brilliance, and unique mineral heritage.

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Stibiotantalite – Properties, Meaning, Care & Buying Guide

Stibiotantalite – Properties, Meaning, Care & Buying Guide

March 18, 2026 | Gemstone Encyclopedia | Joaquimma Anna

Stibiotantalite is a rare violet-to-pink oxide mineral prized for its high brilliance and adamantine luster, used in fine jewelry and sought after by collectors for its unique color and rarity.

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Powellite: Calcium Molybdate Gemstone Profile

Powellite: Calcium Molybdate Gemstone Profile

March 18, 2026 | Gemstone Encyclopedia | Joaquimma Anna

Powellite is a calcium molybdate gemstone known for its clear to gray hues, adamantine luster, and rarity as a collector’s stone, making it intriguing for those interested in mineral meaning, jewelry use, and careful care.

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Brookite – Mineral and Gemstone Encyclopedia Entry

Brookite – Mineral and Gemstone Encyclopedia Entry

March 15, 2026 | Gemstone Encyclopedia | Joaquimma Anna

Brookite is a rare titanium oxide mineral, typically brown to black, occasionally yellow or gray, prized by collectors and occasionally set in jewelry for its high brilliance and unique orthorhombic crystals.

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Cuprite – The Red Copper Oxide Gemstone

Cuprite – The Red Copper Oxide Gemstone

March 14, 2026 | Gemstone Encyclopedia | Joaquimma Anna

Cuprite is a deep‑red copper oxide mineral prized for its vivid color and metallic luster, used in jewelry and as a collector’s stone; its striking hue and traditional symbolism make it a favorite among gemstone enthusiasts for personal adornment and metaphysical practice.

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Recent Articles

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  • Preserving Nature’s Art: How to Clean and Store Rare Collector’s Minerals
  • Adamantine Luster: Which Gemstones Have the Highest Brilliance?
  • Green Gemstones Guide: Meanings, Varieties, and Identification
  • Plagioclase Feldspar Guide: Understanding the Family of Andesine, Albite, and Anorthite
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