I've found melting points for a few minerals that aren't in the latest release.
Cassiterite melts at 1125°C (12025°D).
Source.Sphalerite, according to wikipedia, is Zinc Sulfide and sublimates at 1185°C (12133°D). I suppose that would actually be a
boiling point.
Cinnabar melts at 580°C (11044°D). Source: Wikipedia article on Mercury Sulfide
Jet appears to be a kind of oil-bearing petrified wood, which is often used as a gemstone. It sometimes contains trace amounts of pyrite, which can cause the jet to spontaneously combust when cut. Maybe it should ignite like coal and graphite?
And speaking of petrified wood, the normal variety seems to be made mostly of quartz. (Melting point: 1650°C, 12970°D) This leads to the highly amusing scenario of making your magma-safe mechanisms out of former trees.
Anyway, I'm down to Kimberlite in the raws, and may do some more searching later. I'll let you know if I find anything else.
EDIT: Bismuthinite melts at 760-775°C (11368°D). Sources are blurbs from a couple of scientific journals that show up in Google, but can't be viewed directly because the sites want outrageous amounts of money to look at them. Search "melting point of bismuthinite" and you'll find them.
Marcasite melts at 450°C (10810°D).
SourceHornblende: Melts at 1050°C (11890°D).
SourceMicrocline is odd because it doesn't go straight from solid to liquid at a particular temperature. A small percentage of it will turn liquid at about 1200°C, but it won't completely liquify until it gets to 1440°C (just over DF magma temperature). Still, a half-melted mechanism doesn't work any better than a fully-melted one, so I'd say that for our purposes, this stuff isn't magma-safe.
Obsidian melts at 1350°C (12430°D), so not magma-safe, just in case anyone was wondering.
Also, I find it funny that Toady put in a comment about Alunite being used to make fire retardent, but neglected to put in its obviously-safe-for-magma melting point.
So this means we're still missing:
Kimberlite
Puddingstone (isn't really a single mineral, but a mixture)
Jet (may ignite)
Cobaltite
Garnierite
Limonite (can't find actual numbers, but sources say melting point is relatively low)
...and several layer rocks that are probably not magma-safe.