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Cinnabar is the more stable form, and is a structure akin to that of HgO: each Hg center has two short Hg−S bonds (each 2.36 Å), and four longer Hg···S contacts (with 3.10, 3.10, 3.30 and 3.30 Å separations). In addition, HgS is found in a black, non-cinnabar polymorph (metacinnabar) that has the zincblende structure. [5]
Like other monocotyledons, such as palms, the dragon's blood tree grows from the tip of the stem, with the long, stiff leaves borne in dense rosettes at the end. It branches at maturity to produce an umbrella-shaped crown, with leaves that measure up to 60 cm (24 in) long and 3 cm (1.2 in) wide.
The flower heads are seated or have a short stalk, and grow individually in species with large heads or with two to ten together in species with smaller heads, in the axils of the leaves near the end of the branches. The general shape of the heads is a flattened, round, egg- or cone-shaped sphere of 2–15 cm (0.79–5.91 in) in diameter.
The hard, green leaves are set alternately along the branches, more or less directed upwards, oval or heart-shaped with an entire margin near the flowers and bluntly oblong and with up to six bony teeth at the tip lower down, 2–8 cm (0.79–3.15 in) long and 2–4½ cm (0.8–1.8 in) wide, softly hairy at first, becoming hairless.
Leucospermum secundifolium is a low, evergreen shrub that grows along the ground, the tip of the branches slightly rising, which has been assigned to the family Proteaceae. It has narrowly elliptic leaves with a distinct leafstalk, and few-flowered and very small heads of 1–1½ cm (0.4–0.6 in) across.
Scadoxus cinnabarinus grows from a short rhizome.Many other species of Scadoxus have a pseudostem (false stem) formed from the tightly wrapped bases of the leaves.Scadoxus cinnabarinus has at most a very short pseudostem, making the plant shorter than other species, with an overall height of up to 60 cm (24 in).
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This sympodial reed-stemmed Epidendrum displays a pseudomonopodial habit: an individual stem (to 1 m. tall), will grow continuously at the tip for some time bearing fleshy lanceolate green leaves, 2 cm. wide by 10 cm. long, before producing a terminal bloom spike, which usually equals or exceeds the length of the stem.