Corundum

Al2O3

Add one script tag to your page:

<div data-mineralfyi="entity" data-slug="corundum"></div>
<script src="https://cdn.jsdelivr.net/npm/mineralfyi-embed@1/dist/embed.min.js" defer></script>

Embed as an iframe:

<iframe src="https://mineralfyi.com/iframe/entity/corundum/?style=modern&theme=light" width="420" height="400" frameborder="0" loading="lazy" style="border:0;border-radius:10px;max-width:100%"></iframe>

Paste the URL in WordPress, Medium, or Ghost:

https://mineralfyi.com/ko/mineral/corundum/

Shields.io-compatible SVG badge:

Corundum badge ![Corundum](https://mineralfyi.com/badge/entity/corundum.svg)

Web Component:

<mineralfyi-entity slug="corundum"></mineralfyi-entity>
<script src="https://cdn.jsdelivr.net/npm/mineralfyi-embed@1/dist/embed.min.js" defer></script>

Corundum is the second hardest natural mineral after diamond. Its gem varieties are ruby (red, colored by chromium) and sapphire (all other colors). Synthetic corundum is widely used as an abrasive and in laser technology.

결정계 Trigonal
광물 분류 04 Oxides and Hydroxides
모스 경도 9.0
비중 3.98-4.10
색상 Red (ruby), blue (sapphire), various colors
광택 Adamantine
조흔색 Colorless
벽개 None
단구 Conchoidal to uneven
투명도 Transparent
결정 습성 Tabular, prismatic, bipyramidal

모스 경도

Mohs Hardness: 9.0 – 9.0
1 Soft10 Hard

결정계

Trigonal

Explore on Science FYI

ChemFYI
Aluminum (Al) Primary metal in Al₂O₃
ChemFYI
Oxygen (O) Part of Al₂O₃ formula
GemFYI
Ruby Red corundum variety (Cr-doped)
GemFYI
Sapphire Blue corundum variety (Fe/Ti-doped)

Frequently Asked Questions

What is the hardness of Corundum?
Corundum has a Mohs hardness of 9.0.
What crystal system does Corundum belong to?
Corundum crystallizes in the Trigonal crystal system.
What color is Corundum?
Corundum is typically Red (ruby), blue (sapphire), various colors.
What type of luster does Corundum have?
Corundum exhibits a Adamantine luster.
What is the chemical formula of Corundum?
The chemical formula of Corundum is Al2O3.