お知らせ

You can now specify start times for video embeds

閉じる

Popular

Corundum

Corundum is a mineral form of aluminium oxide (Al2O3).

Article in Other Languages

コランダム

Related Articles

Parent Article

Mineral

Child Article

Sibling Article

Posts on pixivShow more on pixiv

Comment(s)

View Comment(s)

Reason for reporting

Details

0/3000

About issues in articles If you find something off in an article, please go ahead and edit it yourself.
If you see that someone else keeps doing illicit activities, please go to their profile and report them via the Report a problem button.

Reported successfully

We're collecting feedback to make pixiv Encyclopedia even better. If you have any comments or if you found any problems, please contact us.

Please note that we do not reply to Feedbacks. If you need help, please visit our Help Center.

Type

Your browsing environment

When did the issue occur? *Required

Details *Required

Please do not include any personal information

Where did the issue occur? (Page URL)

Your feedback was sent successfully.

If you notice anything else, please send us your Feedback at any time.

You can now edit a section by clicking on the header

Login required

You need a pixiv account to use certain pixiv Encyclopedia features.