Mountain of Black Glass

Mountain of Black Glass
AuthorTad Williams
Cover artistMichael Whelan
LanguageEnglish
SeriesOtherland
GenreScience fiction
PublisherDAW Books / Donald A. Wollheim
Publication date
September 1, 1999
Publication placeUnited States
Media typePrint (hardback & paperback)
Pages720 (Hardback)
ISBN0-88677-849-2 (Hardback)
OCLC42085452
813/.54 21
LC ClassPS3573.I45563 M68 1999
Preceded byRiver of Blue Fire 
Followed bySea of Silver Light 

Mountain of Black Glass is a science fiction novel by American writer Tad Williams, the third book in his Otherland series. It was first published in 1999 with a paperback edition in 2000.[1]

Continuing from River of Blue Fire it brings the characters together at the battle of Troy and finally to the heart of the Grail Brotherhood.