Cavansite and pentagonite are two stunning minerals that often enchant collectors and crystal enthusiasts alike. Both known for their vibrant blue hues and intriguing crystal formations, these minerals share many similarities yet possess unique characteristics that set them apart. In this blog, we will look at cavansite and pentagonite, their histories, occurrences, uses in jewellery, metaphysical properties, and why they are cherished by collectors.
Cavansite was discovered in 1967 in Malheur County, Oregon, USA. Named after its chemical components: Calcium (Ca), Vanadium (V), and Silicate (Si).
Pentagonite was first identified in 1973 in the Wagholi Quarry in Pune, India. Named for its distinctive five-pointed star crystal formation.
Cavansite (above and below left):
Colour: Bright blue to blue-green.
Crystal Form: Cavansite typically forms in small, well-defined crystal clusters, often radiating from a common centre, creating beautiful rosette or spherical shapes.
Chemical Composition: Ca(VO)Si4O10·4(H2O) (Calcium vanadium silicate hydrate).
Pentagonite (below right):
Colour: Vivid blue, similar to cavansite but can sometimes appear slightly darker.
Crystal Form: Pentagonite forms in slender, elongated, and prismatic crystals, often forming star-like clusters or sprays.
Chemical Composition: Ca(VO)Si4O10·4(H2O) (Calcium vanadium silicate hydrate), identical to cavansite, but with a different crystal structure.
Differences Between Cavansite and Pentagonite
Despite their similarities in colour and chemical composition, cavansite and pentagonite can be distinguished by their crystal forms. Cavansite's radiating rosette clusters differ from the elongated, star-like formations of pentagonite. While this is a helpful distinction in my experience it can sometimes be tricky to tell them apart and I often see crystals described interchangeably. Nature does not always cook to the prescribed recipe and the piece below is a case in point! Most people would probably describe it as cavansite in the absence of obvious star like formations shown on the right above.
Commonly Associated Minerals
Both cavansite and pentagonite are often found with other minerals. They can both be found with any of these other minerals so we cannot use these associations to help us identify pieces that are perhaps not clearly one or the other crystal shape.
Stilbite: Stilbite is a common zeolite mineral often found in association with both cavansite and pentagonite. Stilbite typically forms in sheaf-like aggregates or radiating clusters and has a pearly lustre with colours ranging from white to pink or yellow.
Heulandite: Heulandite, another zeolite, frequently occurs with these blue minerals. It appears in tabular crystals or massive forms with colours that can include white, pink, red, orange, and green.
Apophyllite: Apophyllite crystals are often found alongside cavansite and pentagonite. Apophyllite is usually colourless or white, forming transparent to translucent pyramidal or cubic crystals.
Calcite: Calcite, a common carbonate mineral, is also associated with cavansite and pentagonite. Calcite can appear in a variety of forms and colours, often forming scalenohedral or rhombohedral crystals.
Quartz: Quartz crystals may be present in the same geodes or cavities as cavansite and pentagonite. Quartz is typically clear or white, forming hexagonal prisms.
Localities and Reasons for Specific Occurrence
Both cavansite and pentagonite are predominantly found in the Wagholi Quarry, Poona (Pune) region of Maharashtra, India. The unique geological conditions in this area, characterized by volcanic basalt rock formations, provide the perfect environment for these minerals to form.
Other Occurrences:
Minor deposits of cavansite have also been found in the USA and New Zealand.
Pentagonite remains almost exclusively associated with the Indian deposits.
Current Mining Status
As of the latest reports, mining activity at the Wagholi Quarry has significantly reduced. This reduction is due to various factors including regulatory issues, environmental concerns, and the exhaustion of accessible high-quality deposits. Local authorities have imposed stricter regulations on quarrying activities to mitigate environmental impact, which has also contributed to the decline in mining operations.
Availability of Specimens:
High-quality specimens of cavansite and pentagonite are becoming increasingly rare. Many of the easily accessible deposits have been exhausted, leading to a decrease in the availability of new material on the market. Collectors and dealers primarily rely on existing stocks and previously mined specimens, which are often sold at a premium due to their rarity.
Alternative Sources:
While minor occurrences of cavansite have been reported in places like the USA and New Zealand, these deposits are not as significant or productive as those in India. Consequently, the bulk of the world's supply continues to come from the Wagholi Quarry.
Suitability for Jewellery
While cavansite and pentagonite are visually stunning, their use in jewellery is limited due to their relative softness and fragility (Mohs hardness of 3 to 4). They are more suitable for decorative pieces and collector's items rather than everyday wear. I have seen cavansite jewellery advertised for sale, whilst it looks stunning and is certainly unusual in jewellery I would advise caution on account of the very soft nature of the crystals, it will not be very durable.
Cavansite & Pentagonite: Metaphysical Properties
Spiritual Growth and Enlightenment: these crystals are believed to be powerful stones for spiritual development and enlightenment. They are said to facilitate communication with higher realms, spiritual guides, and angels, making them an excellent aid for meditation and spiritual practices.
Enhanced Intuition and Psychic Abilities: these crystals are thought to heighten intuitive abilities and psychic awareness. Users often seek them for assistance in accessing and interpreting their inner wisdom and intuitive insights.
Emotional Healing and Stability: they are reputed to help release negative emotions and past traumas, promoting emotional balance and stability. Considered to be stones of truth, encouraging honest communication and the release of pent-up emotions.
Creativity and Inspiration: Known for their vibrant blue colour, they are said to stimulate creativity and inspire new ideas. Artists, writers, and creative individuals may find them to be a source of inspiration and motivation.
Clarity and Focus: these crystals are believed to enhance mental clarity and focus, aiding in decision-making and problem-solving and are often used to clear mental fog and improve concentration.
Why you should have these in your collection
Aesthetic Appeal: The vivid blue colour and unique crystal formations make them visually striking and desirable.
Rarity: Their limited geographic occurrence and relatively recent discovery add to their allure and value.
Scientific Interest: Their unique chemical and structural properties offer insights into mineralogical processes.
Metaphysical Value: Many collectors appreciate the purported metaphysical benefits, adding a spiritual dimension to their collection.
Conclusion
Cavansite and pentagonite are remarkable minerals that captivate with their vibrant hues and intriguing crystal structures. Understanding their differences, histories, and properties enhances appreciation for these beautiful gems. Whether valued for their aesthetic appeal, scientific interest, or metaphysical properties, cavansite and pentagonite remain cherished treasures in any mineral collection. Head over to the Geminlogical shop to see our cavansite and pentagonite crystals.