Cavansite & Pentagonite Crystals

Cavansite from India

About Cavansite & Pentagonite crystals

Cavansite is a breathtaking deep blue crystal. It is a hydrous calcium vanadium phyllosilicate. The name is derived from its chemical composition: calcium vanadium silicate. It’s blue coloring comes from vanadium, a metal ion.

Cavansite is polymorphic with Pentagonite. Both have the same chemical composition but a different internal structure.

This generally occurs as a response to changes in temperature or pressure or both during volcanic events. Cavansite is a low-temperature form and pentagonite is a high-temperature form. It is most frequently found in Pune, India, in the Deccan Traps

To distinguish Pentagonite and Cavansite one can compare the two under light with a strong blue component, like halogen or sunlight. The pentagonite is a very pure blue and the cavansite is green in comparison. Cavansite has a bladed tabular habit. It tends to form crystal aggregates, generally in the form of balls, up to a couple of centimeters in size. Sometimes the balls are coarse enough to allow the individual crystals to be seen. Sometimes, cavansite forms bowtie-shaped aggregates. Pentagonite has a prismatic arborescent habit.

cavansite India
Pentagonite india
Bowtie shaped cavansite india

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The Geology of the Indian Deccan Traps.


The Deccan Traps is one of the largest volcanic features on Earth. It consists of numerous layers of solidified flood basalt that together are more than about 2,000 meters (6,600 ft) thick. Today it covers an area of about 500,000 square kilometers (200,000 sq mi), and has a volume of about 1,000,000 cubic kilometres (200,000 cu mi).

The term trap is derived from the Swedish word for stairs (trapp) and refers to the step-like hills forming the landscape of the region. The name Deccan has Sanskrit origins meaning “southern”.

The Deccan Traps began forming 66.25 million years ago, at the end of the Cretaceous period, when lava began to extrude through fissures in the crust known as fissure eruptions. This series of eruptions may have lasted for less than 30,000 years.

The release of volcanic gases, particularly sulfur dioxide, during the formation of the traps may have contributed to climate change. An average drop in temperature of about 2 °C (3.6 °F) was recorded during this period.

Work published in 2014 by geologist Gerta Keller and others on the timing of the Deccan volcanism suggests the Cretaceous–Paleogene (K–Pg) extinction event may have been caused by both the volcanism at the decan traps and the Chicxulub impact event in North America, which would have produced a sunlight-blocking dust cloud that killed much of the plant life and reduced global temperature (this cooling is called an impact winter).


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Cavansite from India
Pentagonite India
cavansite India
Cavansite from India
cavansite India
Pentagonite india
Pentagonite India

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