Rhyolite stone


  • Origin of the name: From the Greek « rheîn » and « lithos », literally translated «flowing stone », it takes its name from its fluid structure. Its microlites (small crystals) show this at the beginning of their development before the volcanic matter solidifies.
  • Chemical composition: Silica-rich glassy volcanic rock composed mainly of quartz
  • Hardness: between 5.5 and 7
  • Crystal System: Amorphous
  • Deposits: Rhyolitic lava eruptions are very rare, except in the following regions of the world: Iceland, Harz, Saxony, Esterel or the Vosges
  • Colours: A wide range, including red, green, brown, violet




An age-old exploited mineral, the history and traditional use of rhyolite stone are however little known. Rhyolite belongs to the group of granites, magmatic plutonic rocks with a grained texture, rich in quartz, potassium feldspars (orthoses), plagioclases and micas (biotites or muscovites). Granite is one of the mineral elements that make up the bulk of the earth’s crust. Very resistant, it is much used in construction under the name of granite, more particularly in the production of paving, decoration, worktops, sculptures… There are now more than 500 different colours of granite, which makes it an interesting material for a wide range of uses.

Granites belong to the family of rocks known as “intrusive” rocks as opposed to those known as « effusive », of eruptive origin such as basalt. They form deep in the earth’s crust as a result of the slow cooling of large magmatic masses mixed with other minerals that crystallize in a certain order: first the micas, then the feldspars and finally the quartz. This crystallization will later lead to the formation of plutons, crystalline masses that will finally appear on the surface as a result of the erosion process of the underlying soils. Other forms of granite are born from the fusion of the earth’s crust during a collision between two tectonic plates. Mainly composed of minerals such as quartz, micas, biotite or muscovite, potassium feldspars and plagioclases, they may also contain hornblende, magnetite, garnet, zircon and apatite.

There are two main models of the petrogenetic processes responsible for the formation of granites. One is the crustal fusion of mineral assemblages at varying levels of composition in the earth’s or oceanic crust, resulting in a granitic liquid; and the other is the mantelic fusion of ultramafic mineral assemblages, resulting in basalts, andesites or diorites. These models, of mantelic and crustal origin, are, however, insufficient to explain the variety of existing granites whose formation most often comes from a contamination or enrichment of basic magma by silica (Na) and alkalis (K), chemical elements that make up the majority of the earth’s crust. This great variety would also be the result of the mixture between basic magma of mantelic origin and granite magma of crustal origin.

The vast majority of granites can therefore have two different origins, mantelic and crustal, but are not mutually incompatible: there are therefore a large number of possible intermediaries. Granite, which is found in the lower part of all continents, is therefore primarily the result of the collision process of lithospheric plates. During this collision, friction between the plates occurs, causing a strong heating under the continental crust. One of the most efficient ways to evacuate the energy resulting from the collision will be either thermal, by melting the crust, or mechanical, by vertical or horizontal shearing. It is therefore this melting of the lower crust followed by a slow drop in temperature that will cause the formation of granites and soil erosion that will allow it to appear on the surface. Granite in all its forms is therefore an important and central element of the earth’s crust. In some parts of the world, such as South Africa, Northeast Brazil and Northwest Australia, they can make up to 75% of the exposed soil surface.


Rhyolite stone, the volcanic equivalent of granite, is in most cases leucocratic (light, pinkish or grey and sometimes blue) but it can also be found in the form of a black gem called obsidian, rich in quartz and with the same chemical properties as glass. Thanks to its high resistance to friction wear, it was, in Roman times, the right material for the construction of grinding wheels to crush the grain or to sharpen metal tools. Today, it is widely used in granular form, especially for ballast (the gravel bed on which TGV railway tracks are built).

Composed of more than 71% silica, this magmatic rock has a low iron and magnesium content, and a low but variable alkaline content (a higher quantity of alkaline feldspar would change it into trachyte). Characteristic of the crystallized mineral elements, the microlitic structure of rhyolite stone allows its composing minerals to be observed with the naked eye, notably quartz (which often contains vitreous inclusions), feldspar and biotite. It belongs to the group known as «extrusive igneous » rocks and is formed as a result of the rapid cooling of a silica-rich SiO2 magmatic mass, such as granite, when it reaches the surface or near-surface.

Depending on their geographical location, these large magmatic masses can originate either from a partial melting of the continental crust or, in most cases, by differentiation of a basaltic magma resulting from the partial melting of peridotite, a major component of the earth’s mantle. From the Greek « rheîn » and « lithos », literally meaning «flowing stone », it takes its name from its fluid structure, as evidenced by the microlites (small crystals) that begin to develop before the volcanic material solidifies. Some varieties, such as obsidian, pechstein, perlite or pyromeride, however, have the distinctive feature of being entirely vitreous, the result of the faster cooling of the magmatic mass, and thus the inhibition of any form of crystallization.

The colours and shapes observed in these lava flows can vary significantly, ranging from green to brown, to any yellow hue, orange, ochre and caramel. These lava flows can also create stripes, bubbles or crystal layers, resulting in surprising colour mixtures as in the case of tropical forest jasper. In the case of a very slow drop in temperature, a dense, black mineral material with some golden inclusions will be obtained, as for obsidian, depending on the quantity of gas trapped when it solidifies. Rhyolitic lava eruptions are currently a fairly rare phenomenon, and have only recently been observed in a few volcanic regions such as Iceland. However, there are many deposits in Harz, Saxony, the Vosges and the Esterel.



Associated with success, abundance, prosperity and hope, rhyolite stone helps to approach life with more serenity and accompanies people with life projects or goals to achieve, especially in financial terms. Enemy of procrastination, it can notably bring the necessary motivation to take work further and guide its wearer towards success. It also promotes creativity and inspiration, which is very useful when building a project. It is therefore an indispensable partner to help realize one’s dreams because it also promotes visualization and the manifestation of desire. By allowing emotional renewal, it promotes peace of mind and brings calm and positivity while removing doubts. It also allows the wearers to get rid of the feeling of powerlessness and to move forward with more serenity towards their dreams.

Emitting warm vibrations of pure love and joy, when this stone is placed on the solar plexus chakra, seat of your personal power, it helps promote low self-esteem and self-respect.
By keeping negative thoughts away and encouraging concentration on individual strengths, it increases self-confidence and helps to maintain a positive attitude in the most difficult situations. Its use helps to let go of fears and insecurities and therefore allows the wearers to focus more on their strengths and talents. Strengthening, it lends a willingness to change bad habits and break away from unhealthy addictions. In the long term, it allows you to abandon certain negative attitudes that can be harmful.

The vibration of this gem is also a great help in learning to communicate with one’s heart. It encourages the understanding of one’s thoughts and emotions and encourages one to express and demonstrate things more clearly. Facilitating communication, it therefore favours good friendship and couple or family relationships, by consolidating the bonds that unite two people who love each other through their exchanges. It will strengthen all the things that are a source of happiness within a relationship, while alleviating weaknesses. The strength and courage to express one’s thoughts and emotions will, furthermore, allow to positively influence any type of relationship and will generally bring more satisfaction and contentment in the life of the owner of this gem. The rhyolite is to be cleaned with clear water or by fumigation with common sage or white sage in order to rid it of possible negative charges that it could have accumulated during its transport. It will also be necessary to take the time to purify it after each use in order to get rid of the negativity it could have acquired during a lithotherapy session. Over time, rhyolite stone will gradually be emptied of its energy. It will thus be advisable to recharge it regularly in order to ensure its effectiveness over time. It can be recharged in the sun (no direct light) or by being placed on a heap of quartz like geode or a piece of amethyst.

It is also possible to set rhyolite so as to guide the vibrations it will send out. To do this, simply place it on the third eye, visualize your objective and what you expect from it, and then formulate it aloud, in the present tense and using positive terms. If you wish to change its program, you should purify the gem again during 24 hours before its new programming. However, programming is not a mandatory step and does not modify its virtues; it simply allows to give a more precise direction to the energies released. It is quite possible to let the gem diffuse its own energy without programming.


Considered by our ancestors as a powerful healing tool due to its high concentration of quartz, rhyolite stone can be used in alternative therapies to help treat a great number of ailments. Beneficial for the body in general, it helps to stimulate or strengthen the immune defenses and system. In addition, it promotes the absorption of vitamins and strengthens and amplifies the efforts involved in combating overweight.

Known for its detoxifying and cleansing action, it improves kidneys and liver functioning and is therefore a great ally for people suffering from kidney stones by helping them to rebalance more quickly. Rhyolite can also help in the treatment of certain skin rashes, particularly skin disorders of viral origin, thanks to its healing properties. Its beneficial therapeutic action on the blood vessels will also help to overcome varicose veins and other circulatory problems, and is also said to have a beneficial role against skin aging.


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  • Artists’ stone