Chert is sometimes called hornstone; also the term chert is often applied to any impure flinty rock, including jaspers.    From Wordnik.com.  [Tseh So, a Small House Ruin, Chaco Canyon, New Mexico :] Reference

"hornstone" type, with porphyritic developments of silicate minerals.    From Wordnik.com.  [The Economic Aspect of Geology] Reference

On the summit I found hornstone and granular felspar.    From Wordnik.com.  [Three Expeditions into the Interior of Eastern Australia, Volume 2] Reference

These hills are of limestone, and rounded, resting upon others of hornstone and jasper.    From Wordnik.com.  [Himalayan Journals — Complete] Reference

Its edges, a little translucid, give it some resemblance to the hornstone, so common in secondary limestones.    From Wordnik.com.  [Personal Narrative of Travels to the Equinoctial Regions of America, During the Year 1799-1804 — Volume 1] Reference

About ten miles N.E. of Great Bay de Noquet, we found flint, or hornstone, in small quantities in the limestone rocks.    From Wordnik.com.  [Personal Memoirs of a Residence of Thirty Years with the Indian Tribes on the American Frontiers] Reference

In the bed of the river, whose waters are beautifully clear, are hornstone rocks, dipping north-east, and striking north-west.    From Wordnik.com.  [Himalayan Journals — Complete] Reference

The flat slabs were generally of slate or hornstone; but many of them, and all the larger ones, were of syenitic granite, split by heat and cold water with great art.    From Wordnik.com.  [Himalayan Journals — Complete] Reference

In many places were strata, sometimes horizontal, but more frequently inclined at an angle of about forty-five degrees, consisting of limestone, hornstone, and conglomerate.    From Wordnik.com.  [A Journey to Katmandu (the Capital of Napaul), with The Camp of Jung Bahadoor; including A Sketch of the Nepaulese Ambassador at Home] Reference

Often they pitch their tent on the ice, and then cut such holes through it, using ice-chisels of metal when they can get copper or iron, but when not, employing tools of flint or hornstone.    From Wordnik.com.  [The Antiquity of Man] Reference

Following up the stream I came to some rapids, where the stream is crossed by large beds of hornstone and porphyry rocks, excessively hard, and pitched up at right angles, or with a bold dip to the north.    From Wordnik.com.  [Himalayan Journals — Complete] Reference

From several of these repositories pottery and ornamental sculpture have been taken, and various articles in silver and copper, also stone weapons, some composed of hornstone unpolished, and much resembling in shape some ancient flint implements found near Amiens and other places in Europe, to be alluded to in the sequel.    From Wordnik.com.  [The Antiquity of Man] Reference

The marl and earthy limestone, which constituted the formation for several days past, had changed, during the day, into a compact white or grayish-white limestone, sometimes containing hornstone; and at the place of our encampment this evening, some strata in the river hills cropped out to the height of thirty or forty feet, consisting of fine-grained granitic sandstone; one of the strata closely resembling gneiss.    From Wordnik.com.  [The Exploring Expedition to the Rocky Mountains, Oregon and California To which is Added a Description of the Physical Geography of California, with Recent Notices of the Gold Region from the Latest and Most Authentic Sources] Reference

During a ride to a natural tank amongst these rocky elevations, I passed from the alluvium to the sandstone, and at once met with all the prevailing plants of the granite, gneiss, limestone and hornstone rocks previously examined, and which I have enumerated too often to require recapitulation; a convincing proof that the mechanical properties and not the chemical constitution of the rocks regulate the distribution of these plants.    From Wordnik.com.  [Himalayan Journals — Complete] Reference

10 Granite, with mammillary hematite -- hornstone.    From Wordnik.com.  [Expedition into Central Australia] Reference