mineral
Banded Agate (specifically Botswana or Apricot Agate)
Silicon Dioxide (SiO2) - Cryptocrystalline Quartz
Hardness: 6.5-7 (Mohs scale); Color: Pink, apricot, white, and gray bands; Luster: Vitreous to waxy; Crystal Structure: Trigonal (microscopic); Cleavage: None; Specific Gravity: 2.60-2.65
- Hardness
- 6
- Color
- Pink, apricot, white, and gray bands
- Luster
- Vitreous to waxy
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Physical properties
Hardness: 6.5-7 (Mohs scale); Color: Pink, apricot, white, and gray bands; Luster: Vitreous to waxy; Crystal Structure: Trigonal (microscopic); Cleavage: None; Specific Gravity: 2.60-2.65
Formation & geological history
Formed through the deposition of silica from groundwater in the cavities of igneous rocks (volcanic vesicles). Over millions of years, these layers of chalcedony build up to create the characteristic banding. Agates are typically found in areas with ancient volcanic activity.
Uses & applications
Commonly used in jewelry (cabochons and beads), decorative ornaments, stone carving, and as tumbled 'pocket stones' for crystal healing and collecting.
Geological facts
Agate is named after the Achates River in Sicily where it was first discovered in ancient times. The unique 'eye' patterns found in some banded agates were historically believed to protect against the 'evil eye'.
Field identification & locations
Identify by its translucent quality and distinct, rhythmic color banding. In the field, look for nodules with a rough, warty exterior that reveal colorful interiors when broken or polished. Found worldwide, with major deposits in Brazil and Botswana.
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