Magnetite
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Physical & Optical Properties
Category
Semi-Precious Gems
Mohs Hardness
5.5 – 6.5
Specific Gravity
5.2
Refractive Index
2.42
Crystal System
Isometric
Luster
Metallic
Cleavage
Good
Fracture
Uneven,Irregular
Color
various
Mohs Hardness
| Mohs | Reference mineral | Magnetite |
|---|---|---|
| 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 Magnetite
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 Magnetite
マグネタイト（磁鉄鉱）は酸化鉄鉱物（四酸化三鉄）で、金属光沢を持つ黒い等軸八面体結晶を形成し、天然磁石として知られる最も磁性の強い天然鉱物の一つです。地球表層のあらゆる岩石や砂浜の砂鉄として産出し、火成岩・変成岩・堆積岩を問わず広く分布します。一部のマグネタイトはスターストーン（磁鉄星石）と呼ばれる4条または6条のシルクキャッツアイを示すカボションに加工され、工業的には最も重要な鉄鉱石の一種でもあります。
On this page
Jewelry Use
Durability
4/10
Science FYI Family
Frequently Asked Questions
What is Magnetite?
マグネタイト（磁鉄鉱）は酸化鉄鉱物（四酸化三鉄）で、金属光沢を持つ黒い等軸八面体結晶を形成し、天然磁石として知られる最も磁性の強い天然鉱物の一つです。地球表層のあらゆる岩石や砂浜の砂鉄として産出し、火成岩・変成岩・堆積岩を問わず広く分布します。一部のマグネタイトはスターストーン（磁鉄星石）と呼ばれる4条または6条のシルクキャッツアイを示すカボションに加工され、工業的には最も重要な鉄鉱石の一種でもあります。
What is the hardness of Magnetite?
Magnetite has a Mohs hardness of 5.5 to 6.5, making it moderate for use in jewelry.
What color is Magnetite?
Magnetite is primarily Various.
How much does Magnetite cost?
Magnetite falls into the Budget (< $50/ct) price range. Prices vary based on color, clarity, cut, and origin.
What is the crystal system of Magnetite?
Magnetite belongs to the Isometric crystal system.