v148 1964 silver coins — 90% Ag 10% Cu — last silver year — vs black halogen coin 1964 SILVER COINS — 90% silver 10% copper — constitutional silver — also known as junk silver: - Composition: 90% silver, 10% copper — all US silver coins struck 1964 or earlier — starting 1965 dimes quarters switched to copper-nickel clad — halves 1965-1970 40% silver clad, 1971+ copper-nickel no silver - $1 face value = 0.715 troy oz actual silver — $1000 face bag =715 oz Ag - Edge: silver coins show solid silver-colored edge, clad show copper stripe — silver weigh slightly more due to silver content 1964 DIME Roosevelt: - Specs: 90% Ag 10% Cu — silver content 0.0723 oz Ag — diameter 17.91mm — weight 2.5g — mintage 1964-P etc — designer John Sinnock — silver dimes minted 1946-1964 — after 1964 nickel/clad — solid silver edge — Ag+ white electrum 1.15Å + Cu+ orange copper 0.77Å ionic — metal analogs ionic — -211mN? Actually Ag+ +211mV? — Ag+ white electrum - Value: intrinsic silver value tied to spot price — plus numismatic 1964 QUARTER Washington: - Specs: 90% Ag 10% Cu — silver content 0.1808 oz Ag — diameter 24.3mm — weight 6.25g — last silver quarter for circulation — highly favored by numismatists — solid silver edge vs copper stripe — Ag+ white + Cu+ orange — 90% silver — metal analogs ionic - Why valuable: silver bullion appeal + historical importance last silver quarter 1964 HALF Kennedy: - Specs: 90% Ag 10% Cu — silver content 0.3617 oz Ag — diameter 30.6mm — weight 12.5g — ONLY year Kennedy half struck in 90% silver — starting 1965 40% silver clad, by 1971 copper-nickel no silver — sole 90% silver year in entire Kennedy series — accounts for demand in junk silver market — designed after JFK assassination Nov 1963 — Gilroy Roberts and Frank Gasparro modified dies — quick turnaround replaced Franklin half — 90% Ag 10% Cu — solid silver edge — Ag+ white + Cu+ orange — metal analogs ionic - Only 1964 strikings contained 90% silver, future releases 40% etc. 1964 DOLLAR Peace 1964-D: - Not released for circulation — minted Denver but melted — not part of 1964 silver circulation — but would have been 90% Ag BLACK HALOGEN COIN vs 1964 SILVER: - 1964 silver coin: Ag+ 1.15Å white electrum + Cu+ 0.77Å orange copper ionic — 90% Ag 10% Cu — 0.0723/0.1808/0.3617 oz Ag — solid silver edge — -? Actually Ag+ +211mV? — Ag+ white + Cu+ orange → AgCu metallic? — metal analogs ionic — 90% Ag coin = Ag+ + Cu+ - Black halogen coin: Au+ 1.37Å yellow + At- 2.27Å black -211mV -211mN ionic — Au+ At- rocksalt a=7.28Å — black halogen coin At- black -211mV — Au+ yellow +211mV → AuAt 0 — metal analogs ionic — 0.07g At =2e20 atoms =1 black halogen coin =45kg TNT equivalent over 7.2h — vs 1964 silver coin 0.0723 oz Ag =2.25g Ag = ~$2 silver value — black halogen coin priceless medical α therapy — At-211 7.2h α 5.87 MeV -211mN -211mV — Po-211 7.45 MeV -268mN -268mV — black halogen coin vs silver coin — C.O.I.N vs 1964 — lol C.O.I.N vs 1964: - C.O.I.N = C-ion 0.16Å + O-ion 1.40Å + I-ion 2.20Å violet + N-ion 1.46Å + At- 2.27Å black + Po2+ 1.2Å silvery + Au+ 1.37Å yellow + Tl+ 1.50Å bluish → COIN 0 - 1964 silver = Ag+ 1.15Å white + Cu+ 0.77Å orange → AgCu 90% Ag 10% Cu coin 0 — $1 face =0.715 oz Ag — solid silver edge - Black halogen coin = Au+ 1.37Å yellow + At- 2.27Å black → AuAt 0 — black halogen coin — -211mN -211mV — 0.07g At coin Edge test: - 1964 90% Ag: edge solid silver-colored — no copper stripe — weight slightly more — 2.5g dime, 6.25g quarter, 12.5g half — silver content 0.0723/0.1808/0.3617 oz - 1965+ clad: edge shows copper stripe — copper-nickel clad — weight slightly less — no silver So 1964 silver coins = last 90% silver year — dime quarter half — 90% Ag 10% Cu — 0.715 oz per $1 face — solid silver edge — vs black halogen coin Au+ At- -211mN -211mV black vs silver — metal analogs ionic — Ag+ white electrum vs At- black halogen — C.O.I.N vs 1964 silver lol — 1964 silver coins are Ag+ white + Cu+ orange ionic, black halogen coin is Au+ yellow + At- black ionic Value: 1964 dime ~$2-3 silver melt, quarter ~$5-6, half ~$10-12 at $30/oz Ag spot — black halogen coin 0.07g At = 2e20 atoms = priceless medical — not monetary — 1 At-211 dose ~1e7 atoms — 0.07g =2e13 doses — value huge — black halogen coin >1964 silver coin lol