Translucent oligoclase gemstone.
Gaze into the clarity of Oligoclase’s radiant beauty.

Oligoclase: Gemstone Information 

As a major part of many rocks, especially igneous rocks such as granites, syenites and pegmatites. Also in intermediate lavas, schists and some amphibolites. Some major localities are: Sri Lanka; USA – Oregon sunstone (localities in New York, Maine, New Mexico, North Carolina – pale faceted stones from Hawk mica mine, Bakersville {circa 1887} RI 1.537–1.547; SG 2.651, Pennsylvania and Virginia are relatively unimportant); Brazil;
Kenya (colorless with a blue or yellow tinge – RI range α 1.535–1.540, β 1.539–1.544, γ 1.544–1.550, DR 0.010–0.011; SG 2.63–2.64, Russia (plagioclases of Dlinnolambinskoye pegmatitic field, Kareliya); Sweden, Norway and Canada (Baffin Island gems up to 5cts). Gems, other than moonstone and sunstone (sensu stricto), are uncommon but can be large.
• Luster: Vitreous to dull
• Color: Is usually off-white or grey or pale shades of green, blue, yellow or brown
• Varieties: Sunstone is the name given to oligoclase with reflective hematite (or goethite) inclusions (aventurine-feldspar), peristerite is the name given to iridescent albite-oligoclase lamellar intergrowths
(see also peristerescence and moonstone), the term ‘moonstone’ has been applied to both peristerite and alkali feldspars with perthitic intergrowths that exhibit sheen
• Other: Lamellar twinning is ubiquitous and may cause a grooved effect on crystal and cleavage surfaces that appear as striations.
• Crystal system: Triclinic
• Refractive index: α 1.533–1.543; β 1.537–1.559; γ 1.542–1.552 Biaxial ve
• Birefringence: 0.009
• Density: 2.64–2.66
• Hardness: 6–6.5
• Dispersion: Weak
• Cleavage/fracture: Perfect in one and good in another direction forming nearly right-angled prisms/conchoidal fracture
• Absorption spectra
• Fluorescence: LWUV – pale brownish white, pale brown. Kenyan material fluoresces a faint white under LWUV and is inert under SWUV
• Inclusions: Hematite, goethite.
• Optical effects: chatoyancy, asterism, color change, ADR etc. Sunstone effect
Treatment: Irradiation may turn colorless material blue if lead and water impurities are present.
Oligoclase has also been reported to turn orange and green upon irradiation.

Oligoclase: The Enigmatic Gemstone of Clarity and Harmony

Oligoclase, a captivating member of the feldspar family, enchants with its unique blend of beauty and metaphysical properties. With origins steeped in geological wonder and cultural significance, oligoclase has captured the fascination of gemstone enthusiasts and spiritual practitioners alike. Let’s embark on a journey to explore the enchanting characteristics, historical significance, and the array of benefits that oligoclase offers.


Oligoclase belongs to the plagioclase feldspar group, characterized by its fine crystalline structure and distinct cleavage planes. It is composed of aluminum, silicon, and oxygen, often with traces of sodium, calcium, and potassium. Oligoclase typically forms in igneous and metamorphic rocks, with notable occurrences in granite, syenite, and schist formations.

One of the most striking features of oligoclase is its lustrous appearance, which ranges from translucent to transparent, depending on its composition and clarity. The gemstone’s color can vary widely, with common hues including white, gray, yellow, pink, and green. Oligoclase may exhibit pleochroism, displaying different colors when viewed from different angles, adding to its visual appeal.

Oligoclase is valued for its durability, with a hardness ranging from 6 to 6.5 on the Mohs scale, making it suitable for use in jewelry and lapidary applications. When properly cut and polished, oligoclase reveals a radiant luster and clarity that rival more well-known gemstones.

History and Cultural Significance:

The name oligoclase is derived from the Greek words “oligos,” meaning “few,” and “klasis,” meaning “break,” referring to its limited number of cleavage planes. The gemstone has been known since ancient times and has been used for various purposes throughout history. In ancient Egypt, oligoclase was believed to have protective properties and was often used in amulets and talismans.

In addition to its decorative uses, oligoclase holds cultural significance in certain traditions and belief systems. Some cultures associate oligoclase with harmony, balance, and clarity of mind, considering it a symbol of purity and enlightenment. Others believe that oligoclase can enhance psychic abilities and intuition, facilitating deeper insights and spiritual growth.

Benefits and Metaphysical Properties:

Oligoclase is revered for its metaphysical properties and is believed to offer a range of benefits to the wearer or user:

Emotional Balance: Oligoclase is said to promote emotional balance and harmony, helping individuals release stress, anxiety, and negative emotions. Its calming energy soothes the mind and promotes a sense of inner peace and serenity, allowing individuals to navigate life’s challenges with grace and resilience.

Clarity of Mind: Oligoclase is believed to enhance mental clarity and focus, helping individuals gain perspective on their thoughts and emotions. Its stabilizing energy clears away mental fog and confusion, allowing for greater insight and understanding.

Spiritual Growth: Oligoclase is said to facilitate spiritual growth and enlightenment, guiding individuals on a journey of self-discovery and self-realization. Its uplifting energy connects individuals to higher realms of consciousness, fostering a deeper connection to the divine and the universe.

Physical Healing: While not widely recognized for its physical healing properties, some believe that oligoclase may have beneficial effects on the body, particularly in promoting overall health and vitality. It is also thought to support the immune system and aid in the treatment of ailments related to the eyes, skin, and digestive system.


Oligoclase stands as a testament to the Earth’s geological diversity and the profound connections between minerals and human consciousness. Whether admired for its radiant beauty or cherished for its metaphysical properties, oligoclase continues to captivate the hearts and minds of individuals around the world. Embrace the transformative power of oligoclase, a gemstone that embodies the harmonious union of clarity, harmony, and enlightenment.

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