The most formal and angular style of blackletter, characterized by tightly spaced vertical strokes that create a dense, woven texture on the page.
Definition
Textura (also textualis or textura quadrata) is the most formal and angular variety of blackletter script, dominant in northern Europe from the twelfth through fifteenth centuries. Its name derives from the Latin textura ("weaving"), reflecting the dense, even texture created by its tightly spaced vertical strokes. The letterforms are narrow, upright, and sharply angular, with minimal curves and strong vertical emphasis. Textura was the script of Gutenberg's 42-line Bible and the model for the earliest German printing types. It contrasts with the rounder rotunda of southern Europe and the more cursive bastarda.
Source
No access — Robert Bringhurst — p. 346:
The most formal and angular of blackletter scripts.