Decades: 1230s 1240s 1250s 1260s 1270s - 1280s - 1290s 1300s 1310s 1320s 1330s
Years: 1281 1282 1283 1284 1285 - 1286 - 1287 1288 1289 1290 1291
... a mineral physical properties. For example, though diamond and graphite have the same composition, graphite is very soft, while diamond is the hardest of ...
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