|
COOKIES SETTINGS |
Accept all cookies Personalise |
| Accept selected cookies |
Rare pentagonite with bright blue needle-shaped crystals growing on a white zeolite substrate of stilbite. Authentic natural mineral from India, rare collector's item. This rare specimen represents pentagonite (Ca(VO)Si₄O₁₀·4H₂O) - an extremely attractive blue mineral with star-shaped and needle-shaped crystals, which is among the most sought-after zeolite minerals from India.
Weight: 91 g
Stone size: 7.19 x 4.19 x 3.30 cm
Country of origin: India - Maharashtra locality
You are purchasing the mineral shown in the photo.
Exceptional natural Pentagonite from India – an attractive mineralogical rarity distinguished by its intense azure-blue colour, delicate needle-like crystallisation and spectacular star-shaped crystal aggregates. Against the pale host rock, the brilliant blue crystals create an extraordinary natural contrast, making this specimen a truly captivating collector's piece.
This particular specimen features a rich cluster of vivid blue crystals that naturally extend in different directions, forming a radiant, star-shaped structure. The individual crystals display elongated forms, a pronounced vitreous lustre and deep blue colouring, sometimes accompanied by a subtle violet tint. Their contrast with the light-coloured mineral matrix further enhances their colour intensity and three-dimensional appearance.
Pentagonite is a mineralogically fascinating species whose slender, needle-like crystals can form open, radiating and star-shaped arrangements. This characteristic crystal habit often distinguishes it from the related mineral Cavansite and gives Pentagonite specimens a particularly dynamic and striking appearance.
Collectors especially appreciate pieces displaying intense blue colour, well-preserved individual crystals, attractive radiating formations and a strong contrast with the host matrix. This specimen stands out for its abundant blue crystallisation, creating a remarkable natural three-dimensional composition.
Pentagonite is a rare hydrated calcium vanadium silicate with the chemical formula Ca(VO)Si₄O₁₀·4H₂O. It has the same fundamental chemical composition as Cavansite but a different crystal structure. The two minerals are therefore polymorphs – distinct mineral species sharing the same chemical composition.
While Cavansite often forms more compact fan-shaped or rosette-like aggregates, Pentagonite is particularly recognised for its open radiating crystal groups and distinctly elongated individual crystals. Both minerals share an intense blue coloration associated with their vanadium content.
One of the world's most significant Pentagonite localities is Wagholi near Pune in Maharashtra, India. This region is internationally renowned for high-quality blue minerals, especially Cavansite and Pentagonite, which form in cavities within the basaltic rocks of the Deccan Traps.
Pentagonite may form beautiful blue crystal groups on pale mineral associations, often in environments containing apophyllite, stilbite and other secondary minerals. The combination of intense blue crystals and a light-coloured mineral matrix is characteristic of visually attractive collector's specimens from this region.
| Mineral | Pentagonite |
|---|---|
| Origin | India |
| Locality | Wagholi, Pune, Maharashtra, India |
| Chemical formula | Ca(VO)Si₄O₁₀·4H₂O |
| Mineral class | Silicates – phyllosilicates |
| Crystal system | Orthorhombic |
| Mohs hardness | 3–4 |
| Colour | Intense azure blue, occasionally with a violet tint |
| Lustre | Vitreous |
| Crystal habit | Needle-like, radiating and star-shaped aggregates |
| Geological occurrence | Cavities in basaltic rocks, associated with apophyllite and zeolites |
| Mineralogical distinction | Polymorph of Cavansite |
| Character | Rare natural collector's mineral |
Pentagonite is especially appreciated for its rare occurrence, extraordinarily intense blue colour and characteristic open radiating crystal aggregates. Visually impressive specimens featuring well-preserved individual crystals on a pale host matrix make attractive additions to mineralogical collections. This piece stands out for its rich blue crystallisation and beautiful contrast against its natural matrix.
Care instructions: Pentagonite is a delicate mineral with fine crystals that are vulnerable to mechanical damage. Protect it from drops, vibrations, pressure, water and aggressive cleaning agents. We recommend displaying the specimen in a mineral cabinet and removing any dust only with an exceptionally soft, dry brush.
Discover more rare natural minerals, crystals and collector's specimens in the collection at MINERALS-STONES®.
MINERALS-STONES® – rare natural minerals with exceptional crystal formations. 1 piece = 1 original.
Product photographs show the actual specimen offered for sale. Every natural crystal possesses its own individual shape, structure and characteristic appearance.
Rare pentagonite with bright blue needle-shaped crystals growing on a white zeolite substrate of stilbite. Authentic natural mineral from India, rare collector's item. This rare specimen represents pentagonite (Ca(VO)Si₄O₁₀·4H₂O) - an extremely attractive blue mineral with star-shaped and needle-shaped crystals, which is among the most sought-after zeolite minerals from India.
Weight: 91 g
Stone size: 7.19 x 4.19 x 3.30 cm
Country of origin: India - Maharashtra locality
You are purchasing the mineral shown in the photo.
