39^€

Prehnite crystals

Weight 580 gr

CHARACTERISTICS
Weight	580 gr
Size	125x75x50 mm
Reference	220908084
Mineral	mineral species Prehnite
Category	Rocks and minerals
Group	Aggregates and clusters
Country	Morocco

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Formula Ca₂Al(Si₃Al)O₁₀(OH)₂] PREHNITE
O	Oxygen	Other no metal	44.51%
Si	Silicon	Metalloids	21.31%
Ca	Calcium	Alkaline earth metal	20.27%
Al	Aluminum	Poor metal	13.65%
H	Hydrogen	Other no metal	0.25%
			99.99%
Prehnite is a mineral composed of hydrated silicic acid and aluminum. It is colorless to greenish yellow, light green or white and has a glassy, silky texture. Its luster is vitreous to faintly adamantine. Prehnite is usually found in hydrothermal formations and is commonly associated with grossular, phenakite, chlorite, and chalcedony. Optically, it lies at the intersection between anorthite and hydrated silicic acid and belongs to the optical class of clear minerals. Its hardness is between 5 and 6 on the Mohs scale and its density is 2.7 to 3.2 g/cm3. Prehnite is primarily used as a semi-precious stone for making jewelry and carvings, but it is also used in industrial applications such as flooring for high traffic environments and use as a putty, cement and glass of construction.

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Your orders are usually shipped the day of the order and at the latest after 2 working days.

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Once the package is supported by the postal service, delivery times are those announced by the Post (letter followed or Colissimo followed). Parcel shipping from France.

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Our refund and return policy lasts 14 days. You can read the details on the "return and delivery" page.

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