Goethite
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Physical & Optical Properties
Category
Semi-Precious Gems
Mohs Hardness
5.0 – 5.5
Specific Gravity
4.27 – 4.29
Refractive Index
2.26 – 2.398
Crystal System
Orthorhombic
Luster
Adamantine,Silky,Dull (Earthy),Metallic
Cleavage
Perfect
Fracture
Uneven,Splintery
Color
various
Birefringence
0.138
Pleochroism
Visible
Mohs Hardness
| Mohs | Reference mineral | Goethite |
|---|---|---|
| 1 | Talc | |
| 2 | Gypsum | |
| 3 | Calcite | |
| 4 | Fluorite | |
| 5 | Apatite | ● |
| 6 | Orthoclase | |
| 7 | Quartz | |
| 8 | Topaz | |
| 9 | Corundum | |
| 10 | Diamond |
Crystal System
Value & Market
Price Tier
Budget (< $50/ct)
Where to Buy Goethite
Blue Nile
Fine jewelry retailer
James Allen
Gemstone jewelry
Brilliant Earth
Ethically sourced gems
Amazon
Wide selection
Links may earn a commission at no extra cost to you.
About Goethite
ゲーサイト（針鉄鉱）は、酸化水酸化鉄鉱物（FeO(OH)）で、黄褐色から赤褐色・黒色を示します。ゲーテ（Goethe）に因んで命名された鉱物で、ファイアアゲートの虹彩效果を生み出す成分としても知られています。針状結晶は「ファントムクォーツ」のような包有物として美しい標本を形成することがあります。
On this page
Jewelry Use
Durability
4/10
Science FYI Family
Frequently Asked Questions
What is Goethite?
ゲーサイト（針鉄鉱）は、酸化水酸化鉄鉱物（FeO(OH)）で、黄褐色から赤褐色・黒色を示します。ゲーテ（Goethe）に因んで命名された鉱物で、ファイアアゲートの虹彩效果を生み出す成分としても知られています。針状結晶は「ファントムクォーツ」のような包有物として美しい標本を形成することがあります。
What is the hardness of Goethite?
Goethite has a Mohs hardness of 5.0 to 5.5, making it moderate for use in jewelry.
What color is Goethite?
Goethite is primarily Various.
How much does Goethite cost?
Goethite falls into the Budget (< $50/ct) price range. Prices vary based on color, clarity, cut, and origin.
What is the crystal system of Goethite?
Goethite belongs to the Orthorhombic crystal system.