![Green Apophyllite on Stilbite (Fluorapophyllite-(K) [(KCa4Si8O20F)·8H2O] and Stilbite [NaCa4(Si27Al9)O72·28H2O]) — mineral](https://media.rockidentification.com/7fb399d1-8478-4938-9b80-4e09fad6f3dc-compressed.jpg)
mineral
Green Apophyllite on Stilbite
Fluorapophyllite-(K) [(KCa4Si8O20F)·8H2O] and Stilbite [NaCa4(Si27Al9)O72·28H2O]
Hardness: 4.5-5 (Apophyllite) / 3.5-4 (Stilbite); Color: Mint green crystal tips with pale peach/tan base; Luster: Pearly to vitreous; Crystal structure: Tetragonal (prism/pyramid) and Monoclinic (sheaths); Cleavage: Perfect in one direction.
- Hardness
- 4
- Color
- Mint green crystal tips with pale peach/tan base
- Luster
- Pearly to vitreous
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Physical properties
Hardness: 4.5-5 (Apophyllite) / 3.5-4 (Stilbite); Color: Mint green crystal tips with pale peach/tan base; Luster: Pearly to vitreous; Crystal structure: Tetragonal (prism/pyramid) and Monoclinic (sheaths); Cleavage: Perfect in one direction.
Formation & geological history
Formed in volcanic basalt cavities (vugs) through secondary hydrothermal deposition of mineral-rich water. Most commercial specimens are from the Deccan Traps in India, dating back approximately 65 million years.
Uses & applications
Predominantly used as display specimens for mineral collectors and in metaphysical practices (crystal healing). Due to low hardness, it is rarely used in jewelry, but is highly sought after for aesthetic home decor.
Geological facts
Green apophyllite is colored by trace amounts of iron or vanadium. It is famous for its 'pearly' luster on base faces and its presence often indicates the final stages of volcanic activity in a region.
Field identification & locations
Identify by the distinctive four-sided square pyramidal crystal terminations and the 'bow-tie' shaped clusters of associated stilbite. Commonly found in Maharashtra, India. Collectors should look for undamaged crystal points and deep green saturation.
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