AllMineralsRock
Apophyllite
Apophyllite is a popular mineral composed of a group of hydrous silicates. [1]
Apophyllite: Quick Facts and Characteristics
Some quick facts for Apophyllite:- Transparency: Apophyllite can be opaque, translucent or transparent.
- Crystallography: In terms of crystallography, apophyllite can be cubic, orthorhombic or tetragonal.
- Luster: In terms of luster, apophyllite can be greasy, pearly or vitreous (glassy).
- Streak: Apophyllite streaks white.
- Hardness: Apophyllite's hardness ranges from 4.5 to 5 on the Moh's scale.
- Specific Gravity: Apophyllite's specific gravity ranges from 2.3 to 2.5.
Apophyllite: Background and Summary
Apophyllite is a mineral that belongs to the family of phyllosilicates. It is known for its diamond-like transparency and vibrant colors, which range from colorless to yellow, green, pink, and brown. Apophyllite is commonly found in volcanic rocks and is often associated with zeolites. The mineral's name is derived from the Greek words "apo" meaning "off" and "phyllon" meaning "leaf," which is a reference to the mineral's tendency to exfoliate or peel off in thin sheets.One of the easiest ways to identify apophyllite is by its crystal habit. The mineral commonly occurs as well-formed, tabular crystals that are either square or rectangular in shape. The crystals may also occur as prismatic or pyramidal forms. Apophyllite crystals are usually transparent or translucent, and they have a vitreous to pearly luster. The mineral has a perfect cleavage in one direction, which makes it easy to cleave into thin sheets. Apophyllite is also easily distinguished from other minerals by its color and crystal habit.
Apophyllite has several industrial and commercial uses. One of the most significant uses of the mineral is as a source of potassium and other essential nutrients for plant growth. It is also used in the production of high-quality optical lenses, as it has a high refractive index and low dispersion. Apophyllite is also used in the production of cement, concrete, and other construction materials.
Apophyllite: Table of Properties
| Attribute | Apophyllite (src) |
|---|---|
| Transparency | transparent, translucent, opaque |
| Chemical Formula | (K,Na)Ca4Si8O20(F,OH)·8H2O |
| Chemical Composition | a group of hydrous silicates |
| Specific Gravity | 2.3, 2.5 |
| Hardness | 4.5, 5 |
| Streak | white |
| Crystallography | orthorhombic, tetragonal, cubic |
| Refractive Index | 1.53, 1.54 |
| Hydrous | Yes |
| Colors | common: green sometimes: red, blue, gray, pink, white, yellow less common: pale, brown, orange, purple, violet, colorless |
| Category | phyllosilicate |
Apophyllite: FAQ
FAQQ: Is apophyllite a rare mineral?
A: No, apophyllite is not considered a rare mineral. It is commonly found in volcanic rocks and is often associated with zeolites.
Q: Is apophyllite toxic?
A: No, apophyllite is not toxic. It is safe to handle and does not pose any health hazards.
Q: Can apophyllite be used for healing purposes?
A: Yes, apophyllite is believed to have healing properties and is commonly used in crystal healing practices. It is believed to promote relaxation, reduce stress, and enhance spiritual awareness.
Sources
- "Apophyllite." Mindat.org. https://www.mindat.org/min-270.html- "Apophyllite." Geology.com. https://geology.com/minerals/apophyllite.shtml
- "Apophyllite." Crystal Vaults. https://www.crystalvaults.com/crystal-encyclopedia/apophyllite
- Apophyllite: https://en.wikipedia.org/wiki/Apophyllite
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