Rock soap

(Min.) a kind of clay having a smooth, greasy feel, and adhering to the tongue.

See also: Rock

Webster's Revised Unabridged Dictionary, published 1913 by G. & C. Merriam Co.
References in periodicals archive ?
Former Red Rock soap star Steven Mangan has been organising divorce parties for the past 10 years but said the end-of-marriage rituals have been really taking off in recent months.
Brighton cops rock SOAP UPDATE EMMERDALE STV, 7pm DEBBIE is back from her holiday and who is the first person she wants to see?
Each gift package contains Baked Alaska soap, Reindeer Rock soap, Snowman shower jelly, Dirty Springwash shower gel, Rose Jam shower gel, Fair Trade Foot Lotion, King of Skin body butter, Snowman Fun Kit, Ocean Salt face and body scrub, Sandstone soap, D'Fluff shaving soap, Ice Blue soap, Fresh Mint Toothy Tabs, Lip Service lip balm, Big shampoo, Veganese, Million Dollar moisturizer.
Imagine Gift set (pounds 23.95) which contains 70g Therapy Massage Bar, 100g Helping Hands, 200g Blue Skies Bubble Bar,100g Karma Soap, 100g Middle Earth Turns To Rock Soap, 90g Waving Not Drowning Ballistic and 30g Dreamtime Bath Melt.