Historical clue formulations

• Source of some classic rock bands — 2026-08-01
• Marbled gemstone — 2026-07-01
• Stone for some ear gauges — 2024-11-17
• Playing marble material — 2024-04-30
• Brightly colored rock — 2024-04-15
• Tiny type size — 2023-12-16
• Banded gemstone — 2023-10-15
• Marble material — 2022-09-28
• Banded rock — 2022-07-03
• 5.5-point type size — 2022-04-08
• Fire ___ (gemstone) — 2021-06-25
• Stone with curved bands — 2020-10-15
• Banded marble — 2020-06-09
• Quartz type — 2020-04-04
• Colorful stone in a brooch — 2019-07-14
• Colorful quartz — 2017-12-31
• Type of type — 2017-10-28
• Playing marble — 2016-12-06
• Banded rock — 2016-10-10
• 5 1/2-point type — 2016-09-17
• 5.5-point type — 2016-03-31
• Striped gemstone — 2015-07-07
• Tiny type size — 2015-03-04
• Tiny type size — 2014-09-22
• Brightly colored rock — 2014-06-11
• Rock with bands — 2013-06-12
• Marble material — 2012-10-30
• Playing marble — 2012-04-16
• It has rock bands — 2011-09-23
• Playing marble — 2011-03-07
• Ornamental quartz — 2010-04-20
• Banded gemstone — 2010-04-07
• Cousin of a cat's-eye — 2009-04-01
• Playing marble — 2008-04-14
• Shooter's target — 2008-01-06
• Playing marble — 2007-08-13
• Banded stone — 2007-06-14
• Playing marble — 2007-05-20
• Glass marble — 2005-11-08
• Playing marble — 2005-09-29
• Banded stone — 2005-09-21
• Marble — 2004-10-10
• Rock with bands — 2003-11-15
• Quartz variety — 2003-10-15
• Playing marble — 2003-09-02
• Geode material — 2002-10-17
• It has just a few points — 2002-07-27
• Banded stone — 2001-06-14
• See 56-Down — 2001-05-13
• Fine print, maybe — 2001-04-15