Labradorite Archives - Cochise College Geology

Labradorite

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Labradorite

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feldspar-labradorite-plagioclase twinning

Chemical Group: Silicate (plagioclase feldspar)

Chemical Formula: Labradorite is a mid-composition plagioclase feldspar

Labradorite ranges from 30% to 50% NaAlSi₃O₈and 70% to 50%CaAl₂Si₂O₈.

Color: White, gray, reddish, greenish, yellowish, brown, colorless, sometimes displays schiller, a bluish or multi-colored opalescence.

Transparency: Transparent to translucent

Streak: Uncolored | Luster: Vitreous, pearly | Tenacity: Brittle

Hardness: 5 to 6 | Specific Gravity: 2.60 to 2.75

Fracture: Uneven to conchoidal

Cleavage: (001) perfect and (010) slightly less

Crystal Forms: Triclinic system, Crystals prismatic, Commonly shows polysynthetic (plagioclase) twinning.

Mineral habits: Massive, granular, coarse lamellar

Mineral Associations: Diorite, gabbro, norite, andesite

Identifying Characteristics: Plagioclase twinning and schiller

Uses: Gemstone, decorator rock

Occurrences: Labrador, Canada; New York

Toxicity: When-swallowed: Moderate | When inhaled: High

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Photos

Labradorite 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29

labradorite yellow weathered crystal Mexico — Labradorite - Yellow Weathered Crystal - Mexico

labradorite schiller and plagioclase twinning close view — Labradorite - Schiller And Plagioclase Twinning - Close View

labradorite schiller and plagioclase twinning close view — Labradorite - Schiller And Plagioclase Twinning - Close View

labradorite schiller and plagioclase twinning close view — Labradorite - Schiller And Plagioclase Twinning - Close View

labradorite schiller and plagioclase twinning close view — Labradorite - Schiller And Plagioclase Twinning - Close View

labradorite-schiller and plagioclase twinning close view — Labradorite - Schiller And Plagioclase Twinning - Close View

labradorite schiller and plagioclase twinning close view — Labradorite - Schiller And Plagioclase Twinning - Close View

labradorite schiller and plagioclase twinning — Labradorite - Schiller And Plagioclase Twinning

labradorite schiller and plagioclase twinning — Labradorite - Schiller And Plagioclase Twinning

labradorite schiller and plagioclase twinning — Labradorite - Schiller And Plagioclase Twinning

labradorite polished surface schiller — Labradorite - Polished Surface - Schiller

labradorite polished surface schiller — Labradorite - Polished Surface - Schiller

labradorite polished surface schiller — Labradorite - Polished Surface - Schiller

labradorite schiller and plagioclase twinning — Labradorite - Schiller And Plagioclase Twinning

labradorite polished surface schiller — Labradorite - Polished Surface - Schiller

labradorite polished surface schiller — Labradorite - Polished Surface - Schiller

labradorite plagioclase twinning close view

labradorite polished surface schiller — Labradorite - Polished Surface - Schiller

labradorite polished specimen no schiller — Labradorite - Polished Specimen - No Schiller

labradorite plagioclase twinning close view

labradorite plagioclase twinning close view — Labradorite - Plagioclase Twinning - Close View

labradorite plagioclase twinning close view

labradorite gray massive — Labradorite - Gray - Massive

labradorite plagioclase twinning close view — Labradorite - Plagioclase Twinning - Close View

labradorite-crystal inclusions microscopic view — Labradorite - Crystal Inclusions - Microscopic View

labradorite-crystal inclusions microscopic view — Labradorite - Crystal Inclusions - Microscopic View

labradorite-crystal inclusions microscopic view — Labradorite - Crystal Inclusions - Microscopic View

labradorite-dark brown plagioclase twinning — Labradorite - Dark Brown - Plagioclase Twinning

labradorite cleavage surface — Labradorite - Cleavage Surface

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