Blue Opal — The Stone of Calm Communication
Common Blue Opal is a soothing, tranquil variety of opal admired for its serene shades of sky blue, robin’s egg blue, and soft aqua. Unlike precious opal, common blue opal does not display the famous rainbow “play-of-color.” Instead, its beauty comes from its smooth, even coloration and peaceful appearance. Collectors appreciate Common Blue Opal for its understated elegance, affordability, and connection to volcanic landscapes. Whether polished into jewelry, carved into decorative pieces, or displayed as rough specimens, Common Blue Opal offers a refreshing reminder of still waters and open skies.
AKA
- Blue Common Opal
- Peruvian Blue Opal (when sourced from Peru)
- Andean Blue Opal
- Blue Potch Opal (occasionally used, though technically “potch” refers to non-play-of-color opal)
- Blue Opal
Why Collectors Love It
Collectors are drawn to Common Blue Opal because of its calming color, smooth texture, and versatility. It provides all the natural beauty of opal without the premium price often associated with precious opals. Every piece displays subtle variations in tone, translucency, and internal patterns, making each specimen unique. It is equally popular among mineral collectors, jewelry enthusiasts, and lapidary artists.
Highlights
- Beautiful soft blue to aqua coloration
- No play-of-color, emphasizing pure body color
- Often semi-translucent with a silky glow
- Lightweight and comfortable in jewelry
- Affordable compared to precious opal
- Frequently cut into cabochons, beads, carvings, and freeforms
- Popular with collectors seeking calming blue gemstones
Specifications
- Chemical Formula: SiO₂·nH₂O
- Mineral Type: Hydrated amorphous silica
- Color: Pale blue, aqua, robin’s egg blue, turquoise-blue, occasionally greenish-blue
- Hardness: 5.5–6.5 on the Mohs scale
- Luster: Waxy to vitreous
- Transparency: Opaque to translucent
- Specific Gravity: Approximately 1.9–2.3
- Cleavage: None
- Fracture: Conchoidal to uneven
- Crystal System: Amorphous (non-crystalline)
Localities
Common Blue Opal is found in several locations worldwide, including:
- Peru (the world’s most famous source)
- Oregon, USA
- Nevada, USA
- Idaho, USA
- Mexico
- Australia
- Slovakia
- Ethiopia
- Indonesia
- Honduras
Peruvian deposits are especially prized for producing exceptionally vibrant sky-blue material with remarkable consistency.
Geological Formation
Common Blue Opal forms when silica-rich groundwater slowly fills cavities, fractures, or spaces within volcanic rocks. As the water evaporates over long periods, hydrated silica gels solidify into opal. Trace elements and microscopic inclusions influence the final color, producing the characteristic calming blues that distinguish this variety.
Unlike precious opal, the silica spheres within Common Blue Opal are either irregularly arranged or too small to diffract light into rainbow flashes.
Mineralogy Information
Although classified as a mineraloid rather than a true mineral, Common Blue Opal consists primarily of hydrated silica with varying amounts of water trapped within its structure. Water content commonly ranges from 3% to over 20%, depending on the specimen and locality.
Its amorphous internal structure differentiates it from crystalline quartz despite sharing similar chemical composition.
Key Features
- Soft pastel blue coloration
- Smooth, waxy surface
- Lacks rainbow play-of-color
- Lightweight feel
- Frequently translucent around edges
- Naturally calming visual appearance
- Easy to polish into highly reflective cabochons
The Geological Era
Most Common Blue Opal deposits formed during the Cenozoic Era, particularly throughout the Miocene and Pliocene epochs, when volcanic activity and hydrothermal systems created ideal conditions for silica deposition. Some deposits formed more recently, while others date back tens of millions of years.
Mineral Class
Mineraloid (Hydrated Silica)
Rock Formation
Common Blue Opal is considered a secondary mineral deposit that commonly develops within:
- Volcanic ash layers
- Rhyolite
- Basalt
- Andesite
- Tuff
- Silica-rich sedimentary environments
It forms through low-temperature hydrothermal and groundwater processes rather than direct crystallization from magma.
Level of Rarity
Common Blue Opal is considered uncommon but readily available.
While not nearly as rare as high-grade precious opal, quality blue material with vivid, even coloration—especially from Peru—is considerably less common than many other ornamental gemstones. Large clean specimens with rich natural color are especially desirable among collectors.
Historical and Folklore Stories Surrounding It
Blue opals from Peru have long been associated with the ancient civilizations of the Andes. Local traditions describe them as gifts from mountain spirits and sacred lakes, believed to embody the peaceful energy of flowing water and open skies.
Some stories suggest these stones were carried by travelers for protection during long journeys through the mountains. Others believed blue opals helped calm disagreements and encouraged honest conversations within families and communities.
Modern crystal enthusiasts often continue these traditions, viewing Common Blue Opal as a symbol of emotional tranquility and heartfelt expression.
Metaphysical Nod
Many believe Common Blue Opal encourages peaceful communication, emotional healing, and inner tranquility. Its gentle blue color is often associated with slowing racing thoughts while promoting clarity, patience, and compassion.
Many associate Common Blue Opal with:
- Speaking honestly and kindly
- Releasing emotional tension
- Encouraging forgiveness
- Supporting creativity
- Reducing stress
- Promoting peaceful relationships
- Inspiring gentle confidence
Associated Chakras
- Throat Chakra
- Heart Chakra
- Third Eye Chakra (by some traditions)
Suggested Mantras
- “My voice is calm, clear, and authentic.”
- “Peace flows through every conversation.”
- “I communicate with compassion and confidence.”
- “I release worry and embrace serenity.”
- “My heart and words are in harmony.”
Display and Care Instructions
Common Blue Opal benefits from thoughtful care due to its moderate hardness and water content.
- Store separately from harder gemstones to prevent scratches.
- Avoid prolonged exposure to direct sunlight or excessive heat.
- Keep away from harsh chemicals and ultrasonic cleaners.
- Clean gently using lukewarm water, mild soap, and a soft cloth.
- Avoid dropping or striking against hard surfaces.
- Display away from extreme temperature fluctuations to reduce the risk of cracking.
With proper care, Common Blue Opal can maintain its natural beauty for generations.
How to Spot a Fake
Because Common Blue Opal is affordable, outright counterfeits are less common than imitations of precious opal, but they do exist.
Signs of genuine Common Blue Opal include:
- Natural variations in color intensity
- Slight translucency around thinner edges
- Waxy or soft vitreous luster
- Smooth but natural internal appearance
- Small inclusions or subtle cloudiness
Potential warning signs include:
- Perfectly uniform plastic-looking color
- Extremely lightweight resin feel
- Visible mold seams
- Air bubbles trapped inside
- Painted or dyed surfaces
- Artificial coatings that peel or chip
When purchasing, reputable sellers should clearly disclose whether material is natural, stabilized, dyed, or synthetic.
Why Trust Wandering Stones
At Wandering Stones, we believe every stone has a story worth sharing. We carefully source our Common Blue Opal from trusted suppliers who value authenticity, responsible sourcing, and quality craftsmanship. Every specimen is selected for its natural beauty, calming color, and collectible appeal.
Whether you’re beginning your crystal journey, expanding a mineral collection, or searching for a meaningful gift, we’re committed to providing genuine stones, accurate geological information, and honest education. Our goal is to help you appreciate Common Blue Opal not only for its beauty, but also for the remarkable natural processes that created it and the inspiration it has offered people throughout history.