It crystallizes in the monoclinic system and typically forms radiating to acicular prismatic crystals with variable color from pink, yellow-red to deep red.
42.
The setae include winged capillaries and pseudocompound forms on the anterior parapodia and winged capillaries, comb-setae and acicular setae on the posterior ones.
43.
Gabbro may be extremely coarse grained to pegmatitic, and some pyroxene-plagioclase cumulates are essentially coarse grained gabbro, some may exhibit acicular crystal habits.
44.
Among the feathery varieties of anthodite is " frostwork ", a type of speleothem consisting of bushes of fine acicular aragonite crystals in radiating clusters.
45.
Its crystal habit is acicular, it is most likely to be found along with the uranyl selenium mineral demesmaekerite, but derriksite is much rarer than demesmaekerite.
46.
It occurs as transparent to translucent orange-brown aggregates of subparallel acicular crystals up to 10 mm in length, and as patches of yellow, fibrous crystals.
47.
Some materials are stiffer than diamond ( e . g . osmium ) but are not harder, and are prone to spalling and flaking in squamose or acicular habits.
48.
In steel it produces a bainite microstructure whereas in cast irons it produces a structure of acicular ferrite and high carbon, stabilized austenite known as " ausferrite ".
49.
Needle stone or needle-zeolite are other informal names, alluding to the common acicular habit of the crystals, which are often very slender and are aggregated in divergent tufts.
50.
Lustrous, acicular, deep wine-red kermesite crystals, up to 4 cm long, on massive sulfide matrix, from Pezinok, Mal?Karpaty Mts, Bratislava Region, Slovakia
