Andesine

Table of contents

1 Pronunciation 2 Etymology 3 Noun 4 Chemical composition 5 Physical properties 6 Related words

Pronunciation

An' day seen

Etymology

Named for the type locality in the Andes Mountains.

Noun

1. A plagioclase feldspar, the third member of the Albite-Anorthite solid solution series. Found in fine-grained andesite lavas. Crystals are rarely seen.

Chemical composition

• Sodium calcium aluminum silicate, Failed to parse (PNG conversion failed; check for correct installation of latex, dvips, gs, and convert): Na_xCa_xAlSi_3O_8

Physical properties

• Moh's Hardness: 6.0
• Specific gravity: 2.68
• Color: Usually reddish-gray to dark gray
• Luster: glassy
• Fracture: conchoidal
• Cleavage: two good at about 94º to each other
• Habit: Triclinic - pinacoidal. Crystals are rarely seen.

Related words

See Rock, Feldspar, Plagioclase