Stilbite-Ca

Overview

Stilbite-Ca is a hydrated tectosilicate mineral with the chemical formula NaCa4(Si27Al9)O72·28H2O. It belongs to the monoclinic crystal system and is part of the zeolite group of minerals. Stilbite-Ca is typically characterized by its vitreous luster, white to colorless or pale yellow color, and a hardness of approximately 3.5 to 4 on the Mohs scale. It has a relatively low density for a silicate mineral, and it is commonly found in fibrous or prismatic crystal forms. This mineral is often associated with low-temperature hydrothermal environments and is used in various industrial applications due to its porous structure and ion-exchange properties.

Etymology

The name 'stilbite-Ca' is derived from the Greek word 'stilbein,' meaning 'to shine,' referring to the mineral's luster. The '-Ca' suffix indicates the dominant calcium content in its chemical composition.

Geological genesis

Stilbite-Ca forms in low-temperature hydrothermal environments, often as a secondary mineral in the alteration of volcanic rocks. It is typically associated with zeolite facies conditions, which are indicative of low-grade metamorphism and hydrothermal activity.

Occurrence

Stilbite-Ca is commonly found in cavities and vugs within basaltic and andesitic volcanic rocks. It is often associated with other zeolite minerals such as heulandite and analcime.

Uses

Stilbite-Ca is primarily used in industrial applications due to its porous structure and ion-exchange capabilities. It is employed in water purification, as a molecular sieve, and in the production of detergents. Its fibrous form can also be used in insulation materials. However, it is not commonly used in gemology or ornamental applications due to its relatively low hardness.

How to recognize it

Stilbite-Ca can be identified by its vitreous luster, white to pale yellow color, and a hardness of 3.5 to 4 on the Mohs scale. It has a white streak and a relatively low specific gravity. It is often confused with other zeolite minerals such as heulandite and analcime due to similar physical properties and occurrence in the same geological environments.

Host rocks

Stilbite-Ca is typically found in basaltic and andesitic volcanic rocks, particularly in cavities and vugs where low-temperature hydrothermal alteration has occurred. It is commonly associated with other zeolite minerals in these environments.

Trivia

Stilbite-Ca is notable for its high water content, which contributes to its porous structure and ion-exchange properties. It is part of a complex mineral group with multiple chemical variations, including calcium- and sodium-rich forms. The mineral is also known for its fibrous crystal habit, which can form attractive radiating aggregates.

Indicative prices

Stilbite-Ca is typically sold as a collector's specimen rather than a gemstone. Prices vary by source and quality, with well-formed crystals or clusters ranging from EUR 20 to EUR 200. Jewelry-grade material is rare, and if available, prices may be higher depending on origin and clarity. Bulk or rough material is generally less valuable.

Affirmations

Cleansing and recharging

Guided meditation

Sit comfortably, hold Stilbite-Ca in your hands. Breathe deeply, focusing on its calming energy. Visualize a soft light surrounding you, bringing peace and emotional clarity.

Body placement

Feng Shui

In Feng Shui, Stilbite-Ca is beneficial in the southeast Wealth sector and the southwest Love sector, where it is believed to promote harmony and positive energy flow.

Pairings with other crystals

Stilbite-Ca pairs well with Amethyst and Selenite. Amethyst enhances spiritual clarity, while Selenite supports purification and amplifies its calming effects.

Crystal bath

Not recommended for direct water immersion — instead place the stone NEXT to the bathtub or use indirect elixir method.

Secondary chakras