DescriptionEB1911 - Volume 07.djvu English: Volume 7 (Constantine, Pavlovich, Demidov) of the 1911 Encyclopædia Britannica Date 1911 Source Internet Archive:...
svg English: Etched figures on a hexagonal prism of nepheline. Date 12 January 2019 Source Own work based on: EB1911 - Volume 07.djvu Author TilmannR...
Calcite.svg English: Etched figures on a hexagonal prism of calcite. Date 12 January 2019 Source Own work based on: EB1911 - Volume 07.djvu Author TilmannR...
Beryl.svg English: Etched figures on a hexagonal prism of beryl. Date 12 January 2019 Source Own work based on: EB1911 - Volume 07.djvu Author TilmannR...
Cube of Blende." striated parallel to one diagonal of each face. Date 5 January 2019 Source Own work based on: EB1911 - Volume 07.djvu Author TilmannR...
DescriptionEB1911 - Volume 29.djvu English: Volume 29 (Index — List of Contributors) of the 1911 Encyclopædia Britannica Date 1911 Source Internet Archive:...
DescriptionEB1911 - Volume 03.djvu English: Volume 3 (Austria, Lower — Bisectrix) of the 1911 Encyclopædia Britannica Date 1911 Source Internet Archive:...
crystal of zircon from Ceylon compared to the ideally developed form. Date 1 January 2019 Source Own work based on: EB1911 - Volume 07.djvu Author TilmannR...
91 from the Encyclopædia Britannica (1911), Volume 7, page 585. Date 5 January 2019 Source Own work based on: EB1911 - Volume 07.djvu Author TilmannR...
octahedron, and the other is flattened parallel to one pair of faces. Date 1 January 2019 Source Own work based on: EB1911 - Volume 07.djvu Author TilmannR...
