metamorphic
Connemara Marble
Ophiocalcite (Serpentinitic Marble)
Hardness: 3-4 (Mohs scale); Color: Variegated shades of green, white, and gray; Luster: Vitreous to waxy when polished; Crystal Structure: Recrystallized carbonate minerals with inclusions; Specific gravity: 2.7-2.8.
- Hardness
- 3-4 (Mohs scale)
- Color
- Variegated shades of green, white, and gray
- Luster
- Vitreous to waxy when polished
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Physical properties
Hardness: 3-4 (Mohs scale); Color: Variegated shades of green, white, and gray; Luster: Vitreous to waxy when polished; Crystal Structure: Recrystallized carbonate minerals with inclusions; Specific gravity: 2.7-2.8.
Formation & geological history
Formed over 600 million years ago during the Precambrian Era. This marble is a result of regional metamorphism of limestone and dolostone containing silicate minerals, which transformed into serpentine under intense heat and pressure.
Uses & applications
Primarily used in jewelry (brooches, pendants, beads), ornamental items, architecture (interior paneling), and religious artifacts like rosaries.
Geological facts
Known as 'Ireland\'s Gemstone,' it is one of the oldest decorative stones in the world. No two pieces are identical due to its complex swirling patterns of green chlorite and serpentine.
Field identification & locations
Identified by its distinctive 'shamrock' green coloring and mottling. It is exclusively found in the Connemara region of County Galway, Ireland. For collectors, authenticity is verified by the natural variations and lack of dye.
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