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Botryolite is a variety of datolite, usually having a botryoidal structure.
 Research Botryolite
Datolite is a mineral of secondary origin found usually in cavities in basalt lavas and similar rocks. It has the formulae CaBSiO4(OH) and a relative hardness of 6.
Research Datolite
Homilite is a borosilicate of iron and lime, near datolite in form and composition.
Research Homilite
Prehnite is a mineral named after Colonel Hendrick Von Prehn who first discovered it at the Cape of Good Hope in South Africa. It was confirmed as a distinct species of mineral in 1788. Prehnite is a hydrous silicate of calcium and aluminium with the formulae Ca2Al2Si3O10(OH)2 and a relative hardness of 6 to 7. Prehnite occurs as a crusty lining in cavities in basalt and related rocks and is associated with zeolites, datolite, pectolite, and calcite. Prehnite has a characteristic green colour. Resembles hemimorphite but is of a lower specific gravity and fuses easily.
Research Prehnite
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The Probert Encyclopaedia was designed, edited and programed by
Matt and Leela Probert
©1993 - 2009 The Probert Encyclopaedia
Southampton, United Kingdom
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