Synthetic/Amorphous Solid

Borosilicate Glass (Manufactured)

SiO2 + B2O3 (Silicon dioxide and Boron trioxide)

Hardness: 5.5-6.5 on Mohs scale; Color: typically colorless/transparent; Luster: Vitreous; Structure: Amorphous (non-crystalline); Specific Gravity: 2.23.

Hardness: 5
Color: typically colorless/transparent
Luster: Vitreous

Identified March 18, 2026More synthetic/amorphous solid →

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Physical properties

Hardness: 5.5-6.5 on Mohs scale; Color: typically colorless/transparent; Luster: Vitreous; Structure: Amorphous (non-crystalline); Specific Gravity: 2.23.

Formation & geological history

Manufactured through the fusion of silica and boron oxide at high temperatures. While silica is found in quartz minerals, this specific form is not a naturally occurring rock.

Uses & applications

Used in laboratory glassware, high-end cookware, and smoking accessories due to its thermal shock resistance and low coefficient of thermal expansion.

Geological facts

Commonly known by brands like Pyrex; it can withstand extreme temperature changes that would shatter standard lime glass. The specimen in the image appears to be a manufactured glass component (such as a 'bowl') rather than a mineral.

Field identification & locations

Identify by its clarity, lack of crystal planes, and weight. It is found in commercial retailers rather than geological sites. For collectors, it is valued for its functional utility rather than geological rarity.

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