tachylyte

[tak-uh-lahyt]
noun Petrography.
a black, glassy form of basalt, readily fusible and of a high luster.
Also, tachylite.


Origin:
1865–70; tachy- + -lyte2

tachylitic [tak-uh-lit-ik] , adjective
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World English Dictionary
tachylyte or tachylite (ˈtækɪˌlaɪt)
 
n
a black basaltic glass often found on the edges of intrusions of basalt
 
[C19: from German Tachylit, from tachy- + Greek lutos soluble, melting, from luein to release; so called because it fuses easily when heated. The form tachylite is influenced by -lite stone]
 
tachylite or tachylite
 
n
 
[C19: from German Tachylit, from tachy- + Greek lutos soluble, melting, from luein to release; so called because it fuses easily when heated. The form tachylite is influenced by -lite stone]
 
tachylytic or tachylite
 
adj
 
tachy'litic or tachylite
 
adj

Collins English Dictionary - Complete & Unabridged 10th Edition
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Encyclopedia Britannica
Encyclopedia

tachylyte

glassy igneous rocks low in silica, such as basalt or diabase. Tachylytes are black with a pitchlike or resinous lustre; in thin sections they are characteristically brown and translucent, and the glass is crowded with granules of magnetite. Tachylytes are found only under conditions that imply rapid cooling, and they are much less common than are the corresponding acid volcanic glasses, principally because of the greater fluidity and greater tendency of basic lavas to crystallize.

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Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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Maybe they sought tachylyte, a dense form of basalt used for arrow points and stone tools.
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