Historical clue formulations

• Crystal-filled rock — 2026-08-10
• One whose beauty is on the inside — 2025-12-26
• Rock with a crystal-filled cavity — 2025-09-16
• It's most beautiful when broken — 2025-08-02
• Crystal-lined stone — 2025-03-10
• Sparkly collectible — 2024-08-09
• Quartz-filled rock — 2024-07-18
• Highlight of a rock collection — 2024-07-04
• Natural find with a cavity — 2023-09-21
• Crystal container — 2023-07-02
• Crystal-filled rock — 2022-04-11
• Rock formation — 2020-03-28
• Piece in a rockhound's collection — 2015-01-29
• Glittery stone — 2014-01-07
• Sparkly rock — 2013-10-09
• Crystal-filled rock — 2013-02-27
• Crystal Cave is one — 2013-02-10
• Rock with a glittery inside — 2013-01-21
• Shiny, hollow paperweight — 2011-10-09
• It has a crystal inside — 2011-09-18
• Sparkly rock — 2010-09-25
• All-natural sparkler — 2010-09-02
• Rock with a crystal inside — 2009-08-03
• Crystal-lined rock — 2008-04-15
• Crystal-lined rock — 2007-06-26
• Keeper for a rock collector — 2006-08-26
• Crystal-lined rock — 2002-09-10
• Crystal-lined stone — 2002-03-11
• Sparkly paperweight — 2002-01-09
• Hollow rock — 2001-05-23
• Sparkler — 2000-08-05
• Crystal-bearing rock — 1999-09-08
• Glittery stone — 1999-02-21
• Crystal rock — 1998-12-22
• Glittery stone — 1998-11-26
• Hollow rock — 1998-10-20
• It may be lined with quartz — 1998-09-03
• Crystal-lined rock — 1997-03-26
• Crystal-lined stone — 1996-12-01
• Hollow rock — 1994-10-22
• Sparkly collectible — 1994-05-15