(Typical Examples)


Mariposa (Butterfly) Jasper is A colorful (pink, yellow, and/or dark blue) rhyolitic thunderegg formation.

An often drab and uninteresting egg-shaped or spherical stone with a matrix shell comprised of silica birthed within volcanic ash, it's what is encapsulated inside of these natural wonders that has captured the minds and hearts of collectors over the years and throughout the world.  When cracked open, the inside of the Thunderegg (called the lens or window) is most often comprised of a beautifully banded Agate as well as brecciated and re-cemented jasper, but can contain occasionally Common Opal.

When the two inner surfaces are polished, the glorious configurations spring forth and truly come to life, usually in the shape of a star or flower-like pattern.

Different from a Geode which is simply a hollow rock containing crystal druse, the Thunderegg is a specific geological departure from the norm and is filled solid with its inner mineral beauty.  They can range in size from less than an inch to four feet in diameter, with weight ranging from less than an ounce to over a ton.  Most of those collected, though, are approximately the size of a baseball and weigh between one to two pounds.

Found very prolifically in Oregon in the U.S. where they adopted it as their state rock in 1965, Thundereggs are also found in Germany, Mexico, Canada, France and various regions in Africa.   These uniquely constructed nodules were formed millions of years ago following volcanic eruptions.  As lava poured forth and began to cool, certain pools of it became "frothy" and developed gas pockets.  As this bubbling brew was hardening, minute amounts of mineral-rich water seeped inside each cavity where, later, as it slowly evaporated, it left behind traces of silica or other minerals.  These trace minerals then began growing within the shell and, over time, filled the "egg" solid with the Agate, Jasper or Common Opal we find there now.  It is commonly thought that through the growth process, the expansion and contraction of the gases (that, or the drying out process) is what created ruptures or cracks in the matrix which eventually became the reason for the unique "star" patterns of internal mineral growth. 

Because the Thunderegg's beauty is held hidden within until we crack them open, this aspect of the stone resonates with the astrological Sign of Scorpio.  Its stellar Agate insides work well with Virgo and Gemini, both of which share Agate as one of their birthstones.  And because the Thunderegg is most often highly-collected in its duo form - the two pieces of the split stone having its inside faces polished and where those two facial designs appear identically mirrored to each other - it becomes an excellent representation of the Equinox, the time of equal day and night...a time of balance...and thus finds its connection with Libra and its ruler Venus, the goddess of love.  These two mirrored pieces of one stone may be used in love spells or as a bonding talisman between two lovers or friends.  And therein lies yet another connection with Ostara - a time of budding love, fertility and joyous renewal. 

Thundereggs, by their very own surprise insides, teach us how better to look within ourselves and appreciate our own inner light and beauty, which it then prompts us to unleash and share with the world.   They push us to recognize that all creatures possess this same inner beauty and light and that, though we may need to search for it, it is always there.  This makes the Thunderegg a perfect catalyst stone for those of us in the Northern Hemisphere, pushing us to jump into spring and to activate our winter musings, insisting we now bring out and release our very best!  For those in the Southern Hemisphere at this time, it will pull you inside yourself to bask in the beauty there as you enter the Mabon harvest and prepare for winter.  These marvelous "eggs" can also help ease stressful situations and will aid us in finding joy and peace no matter where we are in the world. 

Metaphysically, the Thunderegg is known to quell anger and hostility in those who work with it.  It also acts as a glue, enhancing community cooperation and bringing people together to work for a common cause.  It brings stable progress and helps us put the right thought together with the right action in order to manifest our intentions properly and in the best manner. 

Thundereggs are excellent for helping us reach and work with the Other Realms and for providing a link to them, along with facilitating a greater awareness for what we will gather there. 

With the main lore connected to Thundereggs revolving around the mythos of being a weapon of the gods or being attached to the thunder of Thor, we can connect this hearty stone to clairaudience - its own "thunder" creating an attention-grabbing way for us to hear and discern what messages we are receiving from practically anything around us.  If you have trouble hearing or noticing opportunistic mystical guidance, a Thunderegg can be a very helpful aid.  If you feel your mind is very active already and that you have no problem in receiving subtle messages, then I would suggest saving Thunderegg medicine for another time.  I personally haven't used Thunderegg medicine very often, but I do own one that has helped me in receiving Totemic messages, as I find the designs within the egg often mimic the shape of whatever is trying to get our attention.  For example, I noticed years ago that my smallest Thunderegg contains the image of not only the initial Squirrel I saw there, but also one of a Dolphin and a Dove...each viewable as you turn the stone deosil.  It is my "Work + Play = Rejuvenation" stone.

 Thundereggs collected from Mt. Hay in Queensland, Australia, have earned the nickname "Amulet Stones" and when polished on the outer surface and placed under a UV light, often exhibit a shimmering spring green glow.  They are carried for good luck and protection.  For other myth and lore connected to Thundereggs we can look to the essence of its center, be it Agate, Jasper, Opal or other mineral.  Finding out what your "egg" contains will give you strong hint of its additional powers.  Since the majority of Thundereggs contain Agate in some form, we can expect those to help us in the following ways: For eloquence of truths, enhancement of perceptions, analytical prowess, and strength of protection.  For creative dreams, increased concentration, enhancement of memory, and communication with all others.

Agate is noted in the metaphysical world to be a good protective energy stone, especially for children, and very calming and soothing. It is also said to help strengthen the body's connection to the earth. It is reported to mystically give courage, energy, strength, and dispels fears, all of which increase self-confidence. It is said to lessen feelings of envy by grounding the emotions. Agate is also used in crystal emotional healing for resolving bitterness and resentments. It is also called and believed to be a stone of harmony. These two factors make it a stone that's said to help improve and harmonize relationships. Also, by bringing the elements of one's being into harmony it greatly enhances healing. Agate also enhances creativity and stimulates the intellect. Agate is considered a stone that brings good luck. It works with chakras according to stone color.


Anyone can benefit from the subtle energies of healing, but it is not meant as a substitute for seeking medical advice from a qualified medical practitioner. The information about the metaphysical properties of stones on this website is intuitive and not scientifically verified. This field is speculative and exploratory. Individuals need to use discrimination to determine what is true for them. We cannot guarantee any results with any stone or jewelry item. We do not advocate the use of stones as a substitute for medical or psychological care. Our stones are not intended to treat or cure any disease.

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