３月６日。
アメシスト・ドーム。『宝石 地球がうみだすキセキ』*1。国立科学博物館*2。
*2:http://www.kahaku.go.jp/ See also https://sumita-m.hatenadiary.com/entry/20100526/1274895252 https://sumita-m.hatenadiary.com/entry/20100629/1277839222 https://sumita-m.hatenadiary.com/entry/20160517/1463511219 https://sumita-m.hatenadiary.com/entry/20160609/1465490540 https://sumita-m.hatenadiary.com/entry/20161020/1476937370 https://sumita-m.hatenadiary.com/entry/20180313/1520918074 https://sumita-m.hatenadiary.com/entry/20180314/1521005237 https://sumita-m.hatenadiary.com/entry/20180422/1524359490 https://sumita-m.hatenadiary.com/entry/20181014/1539500739 https://sumita-m.hatenadiary.com/entry/2019/04/06/102306 https://sumita-m.hatenadiary.com/entry/2019/11/10/014017 https://sumita-m.hatenadiary.com/entry/2020/01/19/143946 https://sumita-m.hatenadiary.com/entry/2020/03/16/110419 https://sumita-m.hatenadiary.com/entry/2020/07/14/000136 https://sumita-m.hatenadiary.com/entry/2020/08/13/084406 https://sumita-m.hatenadiary.com/entry/2021/05/08/213533
