Due to obsidian's policy of not being able to use online or local vault images.The option for related built-in online images has been removed, but custom settings are retained. Please set the URL for ...

The twenty-two lithics in the teaching kit are made from six raw material types: quartzite, black chert (cryptocrystalline silicate), nephrite, ironstone, amphibolite and obsidian (Figure 2, spectrum ...