Acicular

Acicular: needle-shaped; with a long, slender point.

Explanation of Terms Used in Entomology John. B. Smith

However, these finer thread-forms are comparatively rare, while the bolder and needle - like crystals occur constantly; so that, I believe, "Needle - crystal" is the best word (the grand one is, "Acicular crystal," but Sibyl will tell you it is all the same, only less easily understood; and therefore more scientific).

The Ethics of the Dust John Ruskin 1859

However, these finer thread forms are comparatively rare, while the bolder and needle-like crystals occur constantly; so that, I believe, 'Needle-crystal' is the best word (the grand one is 'Acicular crystal,' but Sibyl will tell you it is all the same, only less easily understood; and therefore more scientific).

The Crown of Wild Olive also Munera Pulveris; Pre-Raphaelitism; Aratra Pentelici; The Ethics of the Dust; Fiction, Fair and Foul; The Elements of Drawing John Ruskin 1859

_Acicular arsenical lead ore_, at St. Prix, in the department of

Paris as It Was and as It Is Francis W. Blagdon 1798