Difference between revisions of "Labradorite"
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[[File:2006.400-SC175764.jpg|thumb|Brooch<br>MFA# 2006.400]] | [[File:2006.400-SC175764.jpg|thumb|Brooch<br>MFA# 2006.400]] | ||
== Description == | == Description == | ||
| + | [[File:Image1_Labradorite.jpg|thumb|Labradorite stone]] | ||
A hard, dense grayish-brown [[plagioclase]] feldspar quarried on Saint Paul Island, Labrador, Canada (Lent 1925). Labradorite also comes in a pale turquoise, bright orange, soft pink and strong blue colors that, when iridescent, are called [[sunstone|sunstones]]. Labradorite has been used for interior decoration and gemstones. | A hard, dense grayish-brown [[plagioclase]] feldspar quarried on Saint Paul Island, Labrador, Canada (Lent 1925). Labradorite also comes in a pale turquoise, bright orange, soft pink and strong blue colors that, when iridescent, are called [[sunstone|sunstones]]. Labradorite has been used for interior decoration and gemstones. | ||
| − | [[ | + | [[File:Labradoritekes.jpg|thumb|Labradorite]] |
== Synonyms and Related Terms == | == Synonyms and Related Terms == | ||
| − | labradorite (Port.); spectrolite (variety found in Finland) | + | labradorite (Port.); spectrolite (variety found in Finland); sunstone (when aventurescence is present) |
| − | + | [[[SliderGallery rightalign|LabradoriteRS.jpg~Raman (RASMIN)]]] | |
== Physical and Chemical Properties == | == Physical and Chemical Properties == | ||
| − | Triclinic prismatic crystals; | + | * Triclinic prismatic crystals |
| + | * Cleavage = perfect in two directions (90 degrees) | ||
| + | * Fracture = uneven to conchoidal | ||
| + | * Luster = vitreous to pearly | ||
| + | * Streak = white | ||
| + | * Pleochroism = variable; sometimes due to crystal orientation | ||
| + | * Fluorescence = inert | ||
{| class="wikitable" | {| class="wikitable" | ||
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! scope="row"| Refractive Index | ! scope="row"| Refractive Index | ||
| − | | 1. | + | | 1.559-1.568 |
| + | |- | ||
| + | ! scope="row"| Birefringence | ||
| + | | 0.009 | ||
|} | |} | ||
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[[media:download_file_456.pdf|Properties of Common Gemstones]] | [[media:download_file_456.pdf|Properties of Common Gemstones]] | ||
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== Resources and Citations == | == Resources and Citations == | ||
Revision as of 12:25, 12 December 2022
Description
A hard, dense grayish-brown Plagioclase feldspar quarried on Saint Paul Island, Labrador, Canada (Lent 1925). Labradorite also comes in a pale turquoise, bright orange, soft pink and strong blue colors that, when iridescent, are called sunstones. Labradorite has been used for interior decoration and gemstones.
Synonyms and Related Terms
labradorite (Port.); spectrolite (variety found in Finland); sunstone (when aventurescence is present)
Physical and Chemical Properties
- Triclinic prismatic crystals
- Cleavage = perfect in two directions (90 degrees)
- Fracture = uneven to conchoidal
- Luster = vitreous to pearly
- Streak = white
- Pleochroism = variable; sometimes due to crystal orientation
- Fluorescence = inert
| Mohs Hardness | 6.0-6.5 |
|---|---|
| Density | 2.71-2.74 g/ml |
| Refractive Index | 1.559-1.568 |
| Birefringence | 0.009 |
Comparisons
Properties of Common Gemstones
Resources and Citations
- Gem Identification Lab Manual, Gemological Institute of America, 2016.
- Frank A. Lent, Trade names and Descriptions of Marbles, Limestones, Sandstones, Granites and Other Building Stones Quarried in the United States Canada and other Countries., Stone Publishing Co, New York, 1925
- Wikipedia: http://en.wikipedia.org/wiki/Labradorite (Accessed Sept. 7, 2005)