Talc

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Physical & Optical Properties

Category Collector Gems
Mohs Hardness 1.0
Specific Gravity 2.55 – 2.8
Refractive Index 1.539 – 1.596
Crystal System Monoclinic
Luster soapstone
Cleavage Perfect
Color various
Birefringence 0.046

Mohs Hardness

1 Talc 2 Gypsum 3 Calcite 4 Fluorite 5 Apatite 6 Orthoclase 7 Quartz 8 Topaz 9 Corundum 10 Diamond Talc
Mohs hardness of Talc shown against the ten reference minerals, from talc (1) to diamond (10).
Mohs Reference mineral Talc
1 Talc ●
2 Gypsum
3 Calcite
4 Fluorite
5 Apatite
6 Orthoclase
7 Quartz
8 Topaz
9 Corundum
10 Diamond

Crystal System

β a b c Monoclinic a ≠ b ≠ c, α = γ = 90°, β ≠ 90°

Value & Market

Price Tier Budget (< $50/ct)

Where to Buy Talc

Amazon Wide selection

Links may earn a commission at no extra cost to you.

About Talc

タルクはモースの硬度スケールで最も軟らかい鉱物（硬度1）で、マグネシウムケイ酸塩水酸化物として白色・灰色・緑色・褐色を呈し、石鹸のような独特の感触と蝋質の光沢を持つ滑石質岩石に含まれています。高い耐熱性と加工のしやすさから、ペイント、陶磁器、化粧品（タルカムパウダー）、紙の製造に広く利用されています。化粧用・医療用タルクはアスベスト混入の懸念から現在は規制が進んでいます。

On this page

Jewelry Use

Durability 1/10

Science FYI Family

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Frequently Asked Questions

What is Talc?
タルクはモースの硬度スケールで最も軟らかい鉱物（硬度1）で、マグネシウムケイ酸塩水酸化物として白色・灰色・緑色・褐色を呈し、石鹸のような独特の感触と蝋質の光沢を持つ滑石質岩石に含まれています。高い耐熱性と加工のしやすさから、ペイント、陶磁器、化粧品（タルカムパウダー）、紙の製造に広く利用されています。化粧用・医療用タルクはアスベスト混入の懸念から現在は規制が進んでいます。
What is the hardness of Talc?
Talc has a Mohs hardness of 1.0, making it relatively soft for use in jewelry.
What color is Talc?
Talc is primarily Various.
How much does Talc cost?
Talc falls into the Budget (< $50/ct) price range. Prices vary based on color, clarity, cut, and origin.
What is the crystal system of Talc?
Talc belongs to the Monoclinic crystal system.