Proustite

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Physical & Optical Properties

Category Collector Gems
Mohs Hardness 2.5
Specific Gravity 5.51 – 5.64
Refractive Index 2.792 – 3.087
Crystal System Trigonal
Luster Adamantine
Cleavage Distinct
Fracture Uneven,Conchoidal
Color various
Birefringence 0.295
Pleochroism Strong

Mohs Hardness

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

Crystal System

a a a Trigonal (Rhombohedral) a = b = c, α = β = γ ≠ 90°

Value & Market

Price Tier Budget (< $50/ct)

Where to Buy Proustite

Amazon Wide selection

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About Proustite

プロウスタイト（明礬銀鉱、「ルビーシルバー」）は、鮮やかなルビー赤〜緋赤色の銀硫砒塩鉱物で、光を浴びるとダイヤモンド光沢が燦然と輝きます。銀鉱床の酸化帯に産し、ドイツ・ザクセン州、チリ、メキシコなどが著名産地で、歴史的に重要な銀鉱石の一つです。軟らかさと光による分解があるため切り石への加工は困難ですが、美麗な結晶はコレクター向け赤色鉱物標本として最高峰の評価を受けています。

On this page

Jewelry Use

Durability 1/10

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Frequently Asked Questions

What is Proustite?
プロウスタイト（明礬銀鉱、「ルビーシルバー」）は、鮮やかなルビー赤〜緋赤色の銀硫砒塩鉱物で、光を浴びるとダイヤモンド光沢が燦然と輝きます。銀鉱床の酸化帯に産し、ドイツ・ザクセン州、チリ、メキシコなどが著名産地で、歴史的に重要な銀鉱石の一つです。軟らかさと光による分解があるため切り石への加工は困難ですが、美麗な結晶はコレクター向け赤色鉱物標本として最高峰の評価を受けています。
What is the hardness of Proustite?
Proustite has a Mohs hardness of 2.5, making it relatively soft for use in jewelry.
What color is Proustite?
Proustite is primarily Various.
How much does Proustite cost?
Proustite falls into the Budget (< $50/ct) price range. Prices vary based on color, clarity, cut, and origin.
What is the crystal system of Proustite?
Proustite belongs to the Trigonal crystal system.