lepidolite

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lepidolite

Lepidolite Value, Price, and Jewelry Information

Reddish granular or massive lepidolite is usually slabbed for ornamental purposes, such as ashtrays paperweights, and bookends. Faceted micas are...

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Mineralogy of Phyllosilicates and Tectosilicates

Mineralogy of Phyllosilicates and Tectosilicates

The silicate subgroups of phyllosilicates and tectosilicates include minerals used in industry and jewelry. Learn how to identify them.
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Table of Gems Ordered by Crystal System

Table of Gems Ordered by Crystal System

This table contains a selection of minerals gemologists may encounter as jewelry stones or gem specimens. The gems are sorted...
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The Mohs Hardness Scale and Chart for Select Gems

The Mohs Hardness Scale and Chart for Select Gems

The Mohs hardness scale measures a mineral's resistance to scratching. Find the traditional scale here and a chart of select...
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Specific Gravity Values of Selected Gems

Specific Gravity Values of Selected Gems

Measuring specific gravity helps gemologists identify gemstones. The following table lists the specific gravity values for a variety of gem...
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Gem, Mineral, and Rock Scanner Identification Apps Review

Gem, Mineral, and Rock Scanner Identification Apps Review

How accurate are gem, mineral, and rock scanner identification apps? Our review covers the strengths and weaknesses of over 20...
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Mineral Cleavage Testing: A Practical Guide

Mineral Cleavage Testing: A Practical Guide

Cleavage testing is an important procedure for mineral identification. Learn what cleavage means and how to test mineral samples.
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What is a Mineral?

What is a Mineral?

How do scientists define a mineral? Learn what minerals are made of, their many uses, and the difference between gemstones...
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Gemstone Thermal Properties

Gemstone Thermal Properties

Non-destructive tests are critical for gemologists trying to identify gems. Learn how measuring thermal properties, especially thermal inertia, can help....
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Gemstone Toxicity Table

Gemstone Toxicity Table

Gem faceters and jewelry enthusiasts alike should learn about gemstone toxicity. This table has toxicity ratings for 280+ gems, based...
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What is Crystallography?

What is Crystallography?

Crystallography is the study of crystalline solids and their properties. Learn how mineralogists use this to identify minerals.
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