mineral

Yellow Agate

Chalcedony (cryptocrystalline Quartz), SiO2

Hardness: 6.5-7 Mohs scale. Color: Translucent yellow to honey-orange. Luster: Waxy to vitreous. Crystal structure: Trigonal/Microcrystalline. Cleavage: None (conchoidal fracture). Specific Gravity: 2.58–2.64.

Hardness: 6
Color: Translucent yellow to honey-orange
Luster: Waxy to vitreous

Identified March 21, 2026More mineral →

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Physical properties

Formation & geological history

Formed through the deposition of silica from groundwater in cavities (vesicles) of volcanic igneous rocks or sedimentary layers. They are common in ancient basalt flows. Age varies significantly by deposit, ranging from Millions to Billions of years old.

Uses & applications

Used primarily in lapidary arts for jewelry, bookends, and ornaments. Historically used for making mortars and pestles due to hardness. Highly popular for rock tumbling and specimen collecting.

Geological facts

Agate belongs to the chalcedony family. Yellow varieties are often associated with sunlight and personal power in metaphysical circles. This specific specimen appears to be water-worn, likely found on a beach or riverbed, which has naturally tumbled it smooth.

Field identification & locations

Identify in the field by its translucency when held to light and its waxy texture. It is harder than steel and will scratch glass. Commonly found in riverbeds, lake shores (like Lake Superior), and volcanic regions worldwide.

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