horn·fels 
(hôrnfĕlz′)
(hôrnfĕlz′)n. pl. hornfels
A fine-grained metamorphic rock composed of quartz, feldspar, mica, and other minerals, formed by the metamorphism of sedimentary rocks from heat associated with magma.
[German : Horn, horn; see HORNBLENDE + Fels, rock, cliff (from Middle High German vels, from Old High German felis).]
- submissiveness
- submit
- submittal
- submitter
- submontane
- submucosa
- submucosal
- submucosally
- submultiple
- subnet
- subnormal
- subnormality
- subnotebook
- subnuclear
- suboceanic
- suborbital
- suborder
- subordinate
- subordinate clause
- subordinate conjunction
- subordinately
- subordinateness
- subordination
- subordinative
- suborn