hornstein

We again found in this limestone intercalated beds of black hornstein, passing into kieselschiefer.

Travels to the Equinoctial Regions of America 1851

This quartz passes sometimes into hornstein, and sometimes into kieselschiefer (schistose jasper).

Travels to the Equinoctial Regions of America 1851

The transition from primitive to secondary rocks, partaking of the nature of grünstein or grauwacke, or hornstein and trap, presents also an endless variety in every part of the peninsula, so that were I even possessed of the requisite knowledge accurately to describe them, it would tire the patience of the reader.

Travels in Syria and the Holy Land 1822

The transition from primitive to secondary rocks, partaking of the nature of grünstein or grauwacke, or hornstein and trap, presents also an endless variety in every part of the peninsula, so that were I even possessed of the requisite knowledge accurately to describe them, it would tire the patience of the reader.

Travels in Syria and the Holy Land 1822

This quartz passes sometimes into hornstein, and sometimes into kieselschiefer (schistose jasper).

Personal Narrative of Travels to the Equinoctial Regions of America, During the Year 1799-1804 — Volume 2 Alexander von Humboldt 1814

We again found in this limestone intercalated beds of black hornstein, passing into kieselschiefer.

Personal Narrative of Travels to the Equinoctial Regions of America, During the Year 1799-1804 — Volume 3 Alexander von Humboldt 1814

[p. 522] or hornstein and trap, presents also an endless variety in every part of the peninsula, so that were I even possessed of the requisite knowledge accurately to describe them, it would tire the patience of the reader.

Travels in Syria and the Holy Land John Lewis Burckhardt 1800