Opal gemstone is rare or not ?

Opal gemstone:  
- Rare gemstone with opalescence, showing various colors depending on light and source.  
- Mined mainly in Australia, Brazil, Mexico, Ethiopia, and USA.  

Note: Informational only; rarity and value vary with quality and origin.

Opal Gemstone:  
- Name derived from Greek "opallios" meaning "to see a change in color".  
- Recognized for "body color" (dark or white) and play of colors.  
- Main source: Australia (~95% of global supply), also mined in Mexico, Brazil, Honduras, Ethiopia, Czech Republic, USA.  
- Water content: 3–21% (usually 6–10%), Mohs hardness 5.5–6.  
- Fragile: avoid extreme temperature, dryness, or direct sunlight.  
- Historically associated with good fortune and October birthstone.


Note: Informational purposes only; gemstone quality should be verified.

Opal gemstone:  
- Hydrated silica mineraloid, 3–21% water content (usually 6–10%).  
- Found in gaps of rocks like limonite, rhyolite, sandstone, marl, basalt.  
- Rare and highly attractive; popular due to beauty and influence.  


Note: Informational purposes only; gemstone quality should be verified.

Opal gemstone facts:  
- Preferred for fashion and as a high-value astrological gemstone.  
- Greek origin: name signifies color change.  
- Mineraloid with up to 21% water content, mined from sandstone, limonite, basalt, marl, rhyolite.  
- Two types:  
  * Precious opal: internal silica spheres create diffraction and rainbow effect.  
  * Common opal: smooth, blue/green/yellow/brown/dark/clear.  
- Mohs hardness 5.5–6.5; delicate, handle carefully in rings or pendants.  


Note: Informational purposes only; gemstone quality should be verified.