Found around 6 silverfish stone in a non-endportal or similar environment.
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http://minecraft.gamepedia.com/Silverfish
In Snapshot 12w38a, Stone Monster Egg blocks will rarely generate underground in extreme hills biomes
even in previously generated chunks loaded before snapshot12w38a? This is in an area I have spent a lot of time in and am only running into this now
The actual date may be earlier. That Wiki page looks rather outdated compared to others.
But yes, silverfish blocks underground is intended, you can be sure of that.
Monster eggs (the blocks silverfish are in) generate have been generated at very low levels in Extreme hills biomes since 12w38a or so.
Intended.