Leucospermum muirii is a rounded, upright, evergreen shrub of about 1+1⁄2 m (4.9 ft) high, with a single trunk at its base, that is assigned to the Proteaceae.

The flowering branches are slim, 2–3 mm (0.079–0.118 in) thick, which are initially covered with soft grey crinkly hairs, which are lost over time.

The leaves an almost linear to very narrowly spade-shaped, 4–6 cm (1.6–2.4 in) long and 4–10 mm (0.16–0.39 in) wide with three to seven teeth near its tip, the surface at first with soft crisped hairs which are soon lost however.

The lowest, fully merged, part of the perianth, called tube, is about ½ cm (0.2 in) long, cylindric in shape or slightly laterally compressed, hairless at base and minutely powdery where it merges into the middle part (or claws) where the perianth is split lengthwise, which is also powdery or have very short hairs.

The upper part (or limbs), which enclosed the pollen presenter in the bud consists of four narrowly lanceolate lobes of about 2 mm (0.079 in) long, with the outer surface of the limbs facing sideways and to the center of the flower head have a tuft of long hairs, the lobe facing the rim of the flower head hardly so.

The Albertinia pincushion only grows in flats consisting of deep, white sands, where it may form small dense stands, in the company of several Ericaceae, tall Restionaceae, Leucadendron galpinii, Leucospermum praecox and Protea repens.